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leetcode-cn/面试题64. 求1+2+…+n
leetcode
- 1. Two Sum
- 10. Regular Expression Matching
- 100. Same Tree
- 1000. Minimum Cost to Merge Stones
- 1002. Find Common Characters
- 1003. Check If Word Is Valid After Substitutions
- 1004. Max Consecutive Ones III
- 1005. Maximize Sum Of Array After K Negations
- 1008. Construct Binary Search Tree from Preorder Traversal
- 101. Symmetric Tree
- 1010. Pairs of Songs With Total Durations Divisible by 60
- 1011. Capacity To Ship Packages Within D Days
- 1012. Complement of Base 10 Integer
- 1013. Partition Array Into Three Parts With Equal Sum
- 1014. Best Sightseeing Pair
- 1016. Binary String With Substrings Representing 1 To N
- 1017. Convert to Base -2
- 1018. Binary Prefix Divisible By 5
- 1019. Next Greater Node In Linked List
- 102. Binary Tree Level Order Traversal
- 1020. Number of Enclaves
- 1021. Remove Outermost Parentheses
- 1022. Sum of Root To Leaf Binary Numbers
- 1023. Camelcase Matching
- 1025. Divisor Game
- 1026. Maximum Difference Between Node and Ancestor
- 1027. Longest Arithmetic Sequence
- 1028. Recover a Tree From Preorder Traversal
- 1029. Two City Scheduling
- 103. Binary Tree Zigzag Level Order Traversal
- 1030. Matrix Cells in Distance Order
- 1031. Maximum Sum of Two Non-Overlapping Subarrays
- 1032. Stream of Characters
- 1033. Moving Stones Until Consecutive
- 1034. Coloring A Border
- 1035. Uncrossed Lines
- 1037. Valid Boomerang
- 1038. Binary Search Tree to Greater Sum Tree
- 1039. Minimum Score Triangulation of Polygon
- 104. Maximum Depth of Binary Tree
- 1041. Robot Bounded In Circle
- 1042. Flower Planting With No Adjacent
- 1043. Partition Array for Maximum Sum
- 1044. Longest Duplicate Substring
- 1046. Last Stone Weight
- 1047. Remove All Adjacent Duplicates In String
- 1048. Longest String Chain
- 1051. Height Checker
- 1052. Grumpy Bookstore Owner
- 1053. Previous Permutation With One Swap
- 1054. Distant Barcodes
- 106. Construct Binary Tree from Inorder and Postorder Traversal
- 107. Binary Tree Level Order Traversal II
- 1071. Greatest Common Divisor of Strings
- 1072. Flip Columns For Maximum Number of Equal Rows
- 1073. Adding Two Negabinary Numbers
- 1074. Number of Submatrices That Sum to Target
- 1078. Occurrences After Bigram
- 1079. Letter Tile Possibilities
- 108. Convert Sorted Array to Binary Search Tree
- 1080. Insufficient Nodes in Root to Leaf Paths
- 1081. Smallest Subsequence of Distinct Characters
- 1089. Duplicate Zeros
- 109. Convert Sorted List to Binary Search Tree
- 1090. Largest Values From Labels
- 1091. Shortest Path in Binary Matrix
- 1092. Shortest Common Supersequence
- 1094. Car Pooling
- 1096. Brace Expansion II
- 11. Container With Most Water
- 110. Balanced Binary Tree
- 1103. Distribute Candies to People
- 1104. Path In Zigzag Labelled Binary Tree
- 1105. Filling Bookcase Shelves
- 1106. Parsing A Boolean Expression
- 1108. Defanging an IP Address
- 1109. Corporate Flight Bookings
- 111. Minimum Depth of Binary Tree
- 1110. Delete Nodes And Return Forest
- 1111. Maximum Nesting Depth of Two Valid Parentheses Strings
- 112. Path Sum
- 1122. Relative Sort Array
- 1123. Lowest Common Ancestor of Deepest Leaves
- 1125. Smallest Sufficient Team
- 1128. Number of Equivalent Domino Pairs
- 113. Path Sum II
- 1130. Minimum Cost Tree From Leaf Values
- 1137. N-th Tribonacci Number
- 1139. Largest 1-Bordered Square
- 114. Flatten Binary Tree to Linked List
- 1140. Stone Game II
- 1143. Longest Common Subsequence
- 1146. Snapshot Array
- 115. Distinct Subsequences
- 1154. Day of the Year
- 1155. Number of Dice Rolls With Target Sum
- 116. Populating Next Right Pointers in Each Node
- 1160. Find Words That Can Be Formed by Characters
- 1161. Maximum Level Sum of a Binary Tree
- 1162. As Far from Land as Possible
- 1163. Last Substring in Lexicographical Order
- 1169. Invalid Transactions
- 117. Populating Next Right Pointers in Each Node II
- 1170. Compare Strings by Frequency of the Smallest Character
- 1175. Prime Arrangements
- 118. Pascal's Triangle
- 1184. Distance Between Bus Stops
- 1185. Day of the Week
- 1186. Maximum Subarray Sum with One Deletion
- 1187. Make Array Strictly Increasing
- 1189. Maximum Number of Balloons
- 119. Pascal's Triangle II
- 1190. Reverse Substrings Between Each Pair of Parentheses
- 12. Integer to Roman
- 1200. Minimum Absolute Difference
- 1202. Smallest String With Swaps
- 1203. Sort Items by Groups Respecting Dependencies
- 1207. Unique Number of Occurrences
- 1209. Remove All Adjacent Duplicates in String II
- 121. Best Time to Buy and Sell Stock
- 1210. Minimum Moves to Reach Target with Rotations
- 1217. Minimum Cost to Move Chips to The Same Position
- 1219. Path with Maximum Gold
- 122. Best Time to Buy and Sell Stock II
- 1220. Count Vowels Permutation
- 1221. Split a String in Balanced Strings
- 1222. Queens That Can Attack the King
- 1223. Dice Roll Simulation
- 1226. The Dining Philosophers
- 123. Best Time to Buy and Sell Stock III
- 1232. Check If It Is a Straight Line
- 1234. Replace the Substring for Balanced String
- 1235. Maximum Profit in Job Scheduling
- 1237. Find Positive Integer Solution for a Given Equation
- 1238. Circular Permutation in Binary Representation
- 124. Binary Tree Maximum Path Sum
- 1247. Minimum Swaps to Make Strings Equal
- 1248. Count Number of Nice Subarrays
- 1249. Minimum Remove to Make Valid Parentheses
- 125. Valid Palindrome
- 1252. Cells with Odd Values in a Matrix
- 1253. Reconstruct a 2-Row Binary Matrix
- 1254. Number of Closed Islands
- 126. Word Ladder II
- 1260. Shift 2D Grid
- 1262. Greatest Sum Divisible by Three
- 1263. Minimum Moves to Move a Box to Their Target Location
- 1266. Minimum Time Visiting All Points
- 1267. Count Servers that Communicate
- 1268. Search Suggestions System
- 1269. Number of Ways to Stay in the Same Place After Some Steps
- 127. Word Ladder
- 1275. Find Winner on a Tic Tac Toe Game
- 1277. Count Square Submatrices with All Ones
- 1278. Palindrome Partitioning III
- 128. Longest Consecutive Sequence
- 1282. Group the People Given the Group Size They Belong To
- 1283. Find the Smallest Divisor Given a Threshold
- 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
- 1286. Iterator for Combination
- 1287. Element Appearing More Than 25% In Sorted Array
- 1288. Remove Covered Intervals
- 1289. Minimum Falling Path Sum II
- 129. Sum Root to Leaf Numbers
- 1290. Convert Binary Number in a Linked List to Integer
- 1291. Sequential Digits
- 1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
- 1293. Shortest Path in a Grid with Obstacles Elimination
- 1295. Find Numbers with Even Number of Digits
- 1296. Divide Array in Sets of K Consecutive Numbers
- 1298. Maximum Candies You Can Get from Boxes
- 1299. Replace Elements with Greatest Element on Right Side
- 13. Roman to Integer
- 130. Surrounded Regions
- 1300. Sum of Mutated Array Closest to Target
- 1301. Number of Paths with Max Score
- 1302. Deepest Leaves Sum
- 1304. Find N Unique Integers Sum up to Zero
- 1305. All Elements in Two Binary Search Trees
- 1306. Jump Game III
- 1307. Verbal Arithmetic Puzzle
- 1309. Decrypt String from Alphabet to Integer Mapping
- 131. Palindrome Partitioning
- 1310. XOR Queries of a Subarray
- 1311. Get Watched Videos by Your Friends
- 1312. Minimum Insertion Steps to Make a String Palindrome
- 1313. Decompress Run-Length Encoded List
- 1314. Matrix Block Sum
- 1315. Sum of Nodes with Even-Valued Grandparent
- 1316. Distinct Echo Substrings
- 1317. Convert Integer to the Sum of Two No-Zero Integers
- 1318. Minimum Flips to Make a OR b Equal to c
- 1319. Number of Operations to Make Network Connected
- 1320. Minimum Distance to Type a Word Using Two Fingers
- 1323. Maximum 69 Number
- 1324. Print Words Vertically
- 1325. Delete Leaves With a Given Value
- 1326. Minimum Number of Taps to Open to Water a Garden
- 1328. Break a Palindrome
- 1329. Sort the Matrix Diagonally
- 133. Clone Graph
- 1330. Reverse Subarray To Maximize Array Value
- 1331. Rank Transform of an Array
- 1332. Remove Palindromic Subsequences
- 1333. Filter Restaurants by Vegan-Friendly, Price and Distance
- 1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance
- 1335. Minimum Difficulty of a Job Schedule
- 1338. Reduce Array Size to The Half
- 1339. Maximum Product of Splitted Binary Tree
- 134. Gas Station
- 1340. Jump Game V
- 1341. The K Weakest Rows in a Matrix
- 1342. Number of Steps to Reduce a Number to Zero
- 1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
- 1344. Angle Between Hands of a Clock
- 1345. Jump Game IV
- 1346. Check If N and Its Double Exist
- 1347. Minimum Number of Steps to Make Two Strings Anagram
- 1348. Tweet Counts Per Frequency
- 1349. Maximum Students Taking Exam
- 1351. Count Negative Numbers in a Sorted Matrix
- 1352. Product of the Last K Numbers
- 1353. Maximum Number of Events That Can Be Attended
- 1354. Construct Target Array With Multiple Sums
- 1356. Sort Integers by The Number of 1 Bits
- 1357. Apply Discount Every n Orders
- 1358. Number of Substrings Containing All Three Characters
- 1359. Count All Valid Pickup and Delivery Options
- 136. Single Number
- 1360. Number of Days Between Two Dates
- 1361. Validate Binary Tree Nodes
- 1363. Largest Multiple of Three
- 1367. Linked List in Binary Tree
- 1368. Minimum Cost to Make at Least One Valid Path in a Grid
- 137. Single Number II
- 1370. Increasing Decreasing String
- 1371. Find the Longest Substring Containing Vowels in Even Counts
- 1372. Longest ZigZag Path in a Binary Tree
- 1373. Maximum Sum BST in Binary Tree
- 1374. Generate a String With Characters That Have Odd Counts
- 1375. Bulb Switcher III
- 1376. Time Needed to Inform All Employees
- 1377. Frog Position After T Seconds
- 1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree
- 138. Copy List with Random Pointer
- 1380. Lucky Numbers in a Matrix
- 1381. Design a Stack With Increment Operation
- 1382. Balance a Binary Search Tree
- 1383. Maximum Performance of a Team
- 1385. Find the Distance Value Between Two Arrays
- 1386. Cinema Seat Allocation
- 1387. Sort Integers by The Power Value
- 1388. Pizza With 3n Slices
- 1389. Create Target Array in the Given Order
- 139. Word Break
- 1390. Four Divisors
- 1391. Check if There is a Valid Path in a Grid
- 1392. Longest Happy Prefix
- 1397. Find All Good Strings
- 1399. Count Largest Group
- 14. Longest Common Prefix
- 140. Word Break II
- 1400. Construct K Palindrome Strings
- 1401. Circle and Rectangle Overlapping
- 1402. Reducing Dishes
- 1403. Minimum Subsequence in Non-Increasing Order
- 1404. Number of Steps to Reduce a Number in Binary Representation to One
- 1405. Longest Happy String
- 1406. Stone Game III
- 1408. String Matching in an Array
- 1409. Queries on a Permutation With Key
- 141. Linked List Cycle
- 1410. HTML Entity Parser
- 1411. Number of Ways to Paint N × 3 Grid
- 1413. Minimum Value to Get Positive Step by Step Sum
- 1414. Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
- 1415. The k-th Lexicographical String of All Happy Strings of Length n
- 1416. Restore The Array
- 1419. Minimum Number of Frogs Croaking
- 142. Linked List Cycle II
- 1420. Build Array Where You Can Find The Maximum Exactly K Comparisons
- 1422. Maximum Score After Splitting a String
- 1423. Maximum Points You Can Obtain from Cards
- 1424. Diagonal Traverse II
- 1425. Constrained Subsequence Sum
- 1428. Leftmost Column with at Least a One
- 1429. First Unique Number
- 143. Reorder List
- 1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree
- 1434. Number of Ways to Wear Different Hats to Each Other
- 1436. Destination City
- 1437. Check If All 1's Are at Least Length K Places Away
- 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
- 1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows
- 144. Binary Tree Preorder Traversal
- 1441. Build an Array With Stack Operations
- 1443. Minimum Time to Collect All Apples in a Tree
- 1444. Number of Ways of Cutting a Pizza
- 1446. Consecutive Characters
- 1447. Simplified Fractions
- 1448. Count Good Nodes in Binary Tree
- 1449. Form Largest Integer With Digits That Add up to Target
- 145. Binary Tree Postorder Traversal
- 1452. People Whose List of Favorite Companies Is Not a Subset of Another List
- 1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence
- 1456. Maximum Number of Vowels in a Substring of Given Length
- 1457. Pseudo-Palindromic Paths in a Binary Tree
- 1458. Max Dot Product of Two Subsequences
- 146. LRU Cache
- 1460. Make Two Arrays Equal by Reversing Sub-arrays
- 1461. Check If a String Contains All Binary Codes of Size K
- 1462. Course Schedule IV
- 1463. Cherry Pickup II
- 1464. Maximum Product of Two Elements in an Array
- 1467. Probability of a Two Boxes Having The Same Number of Distinct Balls
- 147. Insertion Sort List
- 1470. Shuffle the Array
- 1471. The k Strongest Values in an Array
- 1472. Design Browser History
- 1473. Paint House III
- 1475. Final Prices With a Special Discount in a Shop
- 1476. Subrectangle Queries
- 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum
- 1478. Allocate Mailboxes
- 148. Sort List
- 1480. Running Sum of 1d Array
- 1481. Least Number of Unique Integers after K Removals
- 1482. Minimum Number of Days to Make m Bouquets
- 1483. Kth Ancestor of a Tree Node
- 1486. XOR Operation in an Array
- 1487. Making File Names Unique
- 1488. Avoid Flood in The City
- 1489. Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree
- 149. Max Points on a Line
- 1491. Average Salary Excluding the Minimum and Maximum Salary
- 1492. The kth Factor of n
- 1493. Longest Subarray of 1's After Deleting One Element
- 1494. Parallel Courses II
- 1496. Path Crossing
- 1497. Check If Array Pairs Are Divisible by k
- 1498. Number of Subsequences That Satisfy the Given Sum Condition
- 1499. Max Value of Equation
- 15. 3Sum
- 150. Evaluate Reverse Polish Notation
- 1502. Can Make Arithmetic Progression From Sequence
- 1503. Last Moment Before All Ants Fall Out of a Plank
- 1504. Count Submatrices With All Ones
- 1505. Minimum Possible Integer After at Most K Adjacent Swaps On Digits
- 1507. Reformat Date
- 1508. Range Sum of Sorted Subarray Sums
- 1509. Minimum Difference Between Largest and Smallest Value in Three Moves
- 151. Reverse Words in a String
- 1510. Stone Game IV
- 1512. Number of Good Pairs
- 1513. Number of Substrings With Only 1s
- 1514. Path with Maximum Probability
- 1515. Best Position for a Service Centre
- 1518. Water Bottles
- 1519. Number of Nodes in the Sub-Tree With the Same Label
- 152. Maximum Product Subarray
- 1520. Maximum Number of Non-Overlapping Substrings
- 1521. Find a Value of a Mysterious Function Closest to Target
- 1523. Count Odd Numbers in an Interval Range
- 1524. Number of Sub-arrays With Odd Sum
- 1525. Number of Good Ways to Split a String
- 1526. Minimum Number of Increments on Subarrays to Form a Target Array
- 153. Find Minimum in Rotated Sorted Array
- 1531. String Compression II
- 1534. Count Good Triplets
- 1535. Find the Winner of an Array Game
- 1536. Minimum Swaps to Arrange a Binary Grid
- 1537. Get the Maximum Score
- 1539. Kth Missing Positive Number
- 154. Find Minimum in Rotated Sorted Array II
- 1540. Can Convert String in K Moves
- 1541. Minimum Insertions to Balance a Parentheses String
- 1542. Find Longest Awesome Substring
- 1544. Make The String Great
- 1545. Find Kth Bit in Nth Binary String
- 1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
- 1547. Minimum Cost to Cut a Stick
- 155. Min Stack
- 1550. Three Consecutive Odds
- 1551. Minimum Operations to Make Array Equal
- 1552. Magnetic Force Between Two Balls
- 1553. Minimum Number of Days to Eat N Oranges
- 1556. Thousand Separator
- 1557. Minimum Number of Vertices to Reach All Nodes
- 1558. Minimum Numbers of Function Calls to Make Target Array
- 1559. Detect Cycles in 2D Grid
- 156. Binary Tree Upside Down
- 1560. Most Visited Sector in a Circular Track
- 1561. Maximum Number of Coins You Can Get
- 1562. Find Latest Group of Size M
- 1563. Stone Game V
- 1566. Detect Pattern of Length M Repeated K or More Times
- 1567. Maximum Length of Subarray With Positive Product
- 1568. Minimum Number of Days to Disconnect Island
- 1569. Number of Ways to Reorder Array to Get Same BST
- 157. Read N Characters Given Read4
- 1572. Matrix Diagonal Sum
- 1573. Number of Ways to Split a String
- 1574. Shortest Subarray to be Removed to Make Array Sorted
- 1575. Count All Possible Routes
- 1576. Replace All ?'s to Avoid Consecutive Repeating Characters
- 1577. Number of Ways Where Square of Number Is Equal to Product of Two Numbers
- 1578. Minimum Deletion Cost to Avoid Repeating Letters
- 1579. Remove Max Number of Edges to Keep Graph Fully Traversable
- 158. Read N Characters Given Read4 II - Call multiple times
- 1582. Special Positions in a Binary Matrix
- 1583. Count Unhappy Friends
- 1584. Min Cost to Connect All Points
- 1585. Check If String Is Transformable With Substring Sort Operations
- 1588. Sum of All Odd Length Subarrays
- 1589. Maximum Sum Obtained of Any Permutation
- 159. Longest Substring with At Most Two Distinct Characters
- 1590. Make Sum Divisible by P
- 1591. Strange Printer II
- 1592. Rearrange Spaces Between Words
- 1593. Split a String Into the Max Number of Unique Substrings
- 1594. Maximum Non Negative Product in a Matrix
- 1595. Minimum Cost to Connect Two Groups of Points
- 1598. Crawler Log Folder
- 1599. Maximum Profit of Operating a Centennial Wheel
- 16. 3Sum Closest
- 1600. Throne Inheritance
- 1601. Maximum Number of Achievable Transfer Requests
- 1603. Design Parking System
- 1604. Alert Using Same Key-Card Three or More Times in a One Hour Period
- 1605. Find Valid Matrix Given Row and Column Sums
- 1606. Find Servers That Handled Most Number of Requests
- 1608. Special Array With X Elements Greater Than or Equal X
- 1609. Even Odd Tree
- 161. One Edit Distance
- 1610. Maximum Number of Visible Points
- 1611. Minimum One Bit Operations to Make Integers Zero
- 1614. Maximum Nesting Depth of the Parentheses
- 1615. Maximal Network Rank
- 1616. Split Two Strings to Make Palindrome
- 1617. Count Subtrees With Max Distance Between Cities
- 1619. Mean of Array After Removing Some Elements
- 162. Find Peak Element
- 1620. Coordinate With Maximum Network Quality
- 1621. Number of Sets of K Non-Overlapping Line Segments
- 1622. Fancy Sequence
- 1624. Largest Substring Between Two Equal Characters
- 1625. Lexicographically Smallest String After Applying Operations
- 1626. Best Team With No Conflicts
- 1627. Graph Connectivity With Threshold
- 1631. Path With Minimum Effort
- 1632. Rank Transform of a Matrix
- 1636. Sort Array by Increasing Frequency
- 1637. Widest Vertical Area Between Two Points Containing No Points
- 1638. Count Substrings That Differ by One Character
- 1639. Number of Ways to Form a Target String Given a Dictionary
- 164. Maximum Gap
- 1640. Check Array Formation Through Concatenation
- 1641. Count Sorted Vowel Strings
- 1642. Furthest Building You Can Reach
- 1643. Kth Smallest Instructions
- 1648. Sell Diminishing-Valued Colored Balls
- 1649. Create Sorted Array through Instructions
- 165. Compare Version Numbers
- 1657. Determine if Two Strings Are Close
- 1658. Minimum Operations to Reduce X to Zero
- 166. Fraction to Recurring Decimal
- 1662. Check If Two String Arrays are Equivalent
- 1663. Smallest String With A Given Numeric Value
- 1664. Ways to Make a Fair Array
- 1665. Minimum Initial Energy to Finish Tasks
- 1668. Maximum Repeating Substring
- 1669. Merge In Between Linked Lists
- 167. Two Sum II - Input array is sorted
- 1670. Design Front Middle Back Queue
- 1671. Minimum Number of Removals to Make Mountain Array
- 1672. Richest Customer Wealth
- 1673. Find the Most Competitive Subsequence
- 1674. Minimum Moves to Make Array Complementary
- 1675. Minimize Deviation in Array
- 1678. Goal Parser Interpretation
- 1679. Max Number of K-Sum Pairs
- 1680. Concatenation of Consecutive Binary Numbers
- 1681. Minimum Incompatibility
- 1688. Count of Matches in Tournament
- 1689. Partitioning Into Minimum Number Of Deci-Binary Numbers
- 169. Majority Element
- 1690. Stone Game VII
- 1691. Maximum Height by Stacking Cuboids
- 1694. Reformat Phone Number
- 1695. Maximum Erasure Value
- 1696. Jump Game VI
- 1697. Checking Existence of Edge Length Limited Paths
- 17. Letter Combinations of a Phone Number
- 1700. Number of Students Unable to Eat Lunch
- 1701. Average Waiting Time
- 1702. Maximum Binary String After Change
- 1704. Determine if String Halves Are Alike
- 1705. Maximum Number of Eaten Apples
- 1706. Where Will the Ball Fall
- 1707. Maximum XOR With an Element From Array
- 171. Excel Sheet Column Number
- 1710. Maximum Units on a Truck
- 1711. Count Good Meals
- 1712. Ways to Split Array Into Three Subarrays
- 1713. Minimum Operations to Make a Subsequence
- 1716. Calculate Money in Leetcode Bank
- 1717. Maximum Score From Removing Substrings
- 1718. Construct the Lexicographically Largest Valid Sequence
- 1719. Number Of Ways To Reconstruct A Tree
- 1720. Decode XORed Array
- 1721. Swapping Nodes in a Linked List
- 1722. Minimize Hamming Distance After Swap Operations
- 1723. Find Minimum Time to Finish All Jobs
- 1727. Largest Submatrix With Rearrangements
- 173. Binary Search Tree Iterator
- 1732. Find the Highest Altitude
- 1733. Minimum Number of People to Teach
- 1734. Decode XORed Permutation
- 1736. Latest Time by Replacing Hidden Digits
- 1737. Change Minimum Characters to Satisfy One of Three Conditions
- 1738. Find Kth Largest XOR Coordinate Value
- 1739. Building Boxes
- 174. Dungeon Game
- 1744. Can You Eat Your Favorite Candy on Your Favorite Day?
- 1745. Palindrome Partitioning IV
- 1749. Maximum Absolute Sum of Any Subarray
- 175. Combine Two Tables
- 176. Second Highest Salary
- 1763. Longest Nice Substring
- 1764. Form Array by Concatenating Subarrays of Another Array
- 1765. Map of Highest Peak
- 1766. Tree of Coprimes
- 1768. Merge Strings Alternately
- 1769. Minimum Number of Operations to Move All Balls to Each Box
- 1770. Maximum Score from Performing Multiplication Operations
- 1771. Maximize Palindrome Length From Subsequences
- 1773. Count Items Matching a Rule
- 1774. Closest Dessert Cost
- 1775. Equal Sum Arrays With Minimum Number of Operations
- 1784. Check if Binary String Has at Most One Segment of Ones
- 1785. Minimum Elements to Add to Form a Given Sum
- 1786. Number of Restricted Paths From First to Last Node
- 179. Largest Number
- 1790. Check if One String Swap Can Make Strings Equal
- 1791. Find Center of Star Graph
- 1792. Maximum Average Pass Ratio
- 1793. Maximum Score of a Good Subarray
- 1796. Second Largest Digit in a String
- 1797. Design Authentication Manager
- 1798. Maximum Number of Consecutive Values You Can Make
- 1799. Maximize Score After N Operations
- 18. 4Sum
- 1800. Maximum Ascending Subarray Sum
- 1801. Number of Orders in the Backlog
- 1802. Maximum Value at a Given Index in a Bounded Array
- 1803. Count Pairs With XOR in a Range
- 181. Employees Earning More Than Their Managers
- 182. Duplicate Emails
- 187. Repeated DNA Sequences
- 188. Best Time to Buy and Sell Stock IV
- 189. Rotate Array
- 19. Remove Nth Node From End of List
- 190. Reverse Bits
- 191. Number of 1 Bits
- 195. Tenth Line
- 198. House Robber
- 199. Binary Tree Right Side View
- 2. Add Two Numbers
- 20. Valid Parentheses
- 200. Number of Islands
- 201. Bitwise AND of Numbers Range
- 202. Happy Number
- 203. Remove Linked List Elements
- 204. Count Primes
- 206. Reverse Linked List
- 207. Course Schedule
- 208. Implement Trie (Prefix Tree)
- 209. Minimum Size Subarray Sum
- 21. Merge Two Sorted Lists
- 210. Course Schedule II
- 211. Add and Search Word - Data structure design
- 212. Word Search II
- 213. House Robber II
- 214. Shortest Palindrome
- 215. Kth Largest Element in an Array
- 216. Combination Sum III
- 218. The Skyline Problem
- 219. Contains Duplicate II
- 22. Generate Parentheses
- 220. Contains Duplicate III
- 221. Maximal Square
- 222. Count Complete Tree Nodes
- 223. Rectangle Area
- 224. Basic Calculator
- 225. Implement Stack using Queues
- 226. Invert Binary Tree
- 227. Basic Calculator II
- 228. Summary Ranges
- 229. Majority Element II
- 23. Merge k Sorted Lists
- 230. Kth Smallest Element in a BST
- 231. Power of Two
- 232. Implement Queue using Stacks
- 234. Palindrome Linked List
- 237. Delete Node in a Linked List
- 238. Product of Array Except Self
- 239. Sliding Window Maximum
- 24. Swap Nodes in Pairs
- 240. Search a 2D Matrix II
- 241. Different Ways to Add Parentheses
- 242. Valid Anagram
- 243. Shortest Word Distance
- 244. Shortest Word Distance II
- 246. Strobogrammatic Number
- 247. Strobogrammatic Number II
- 249. Group Shifted Strings
- 25. Reverse Nodes in k-Group
- 250. Count Univalue Subtrees
- 252. Meeting Rooms
- 253. Meeting Rooms II
- 256. Paint House
- 257. Binary Tree Paths
- 258. Add Digits
- 259. 3Sum Smaller
- 26. Remove Duplicates from Sorted Array
- 260. Single Number III
- 261. Graph Valid Tree
- 263. Ugly Number
- 264. Ugly Number II
- 266. Palindrome Permutation
- 268. Missing Number
- 27. Remove Element
- 270. Closest Binary Search Tree Value
- 271. Encode and Decode Strings
- 274. H-Index
- 275. H-Index II
- 278. First Bad Version
- 279. Perfect Squares
- 28. Implement strStr()
- 280. Wiggle Sort
- 281. Zigzag Iterator
- 284. Peeking Iterator
- 285. Inorder Successor in BST
- 287. Find the Duplicate Number
- 289. Game of Life
- 29. Divide Two Integers
- 290. Word Pattern
- 293. Flip Game
- 295. Find Median from Data Stream
- 297. Serialize and Deserialize Binary Tree
- 298. Binary Tree Longest Consecutive Sequence
- 299. Bulls and Cows
- 3. Longest Substring Without Repeating Characters
- 30. Substring with Concatenation of All Words
- 300. Longest Increasing Subsequence
- 301. Remove Invalid Parentheses
- 303. Range Sum Query - Immutable
- 304. Range Sum Query 2D - Immutable
- 307. Range Sum Query - Mutable
- 309. Best Time to Buy and Sell Stock with Cooldown
- 31. Next Permutation
- 310. Minimum Height Trees
- 312. Burst Balloons
- 313. Super Ugly Number
- 315. Count of Smaller Numbers After Self
- 316. Remove Duplicate Letters
- 32. Longest Valid Parentheses
- 320. Generalized Abbreviation
- 321. Create Maximum Number
- 322. Coin Change
- 324. Wiggle Sort II
- 327. Count of Range Sum
- 328. Odd Even Linked List
- 329. Longest Increasing Path in a Matrix
- 33. Search in Rotated Sorted Array
- 330. Patching Array
- 331. Verify Preorder Serialization of a Binary Tree
- 332. Reconstruct Itinerary
- 333. Largest BST Subtree
- 334. Increasing Triplet Subsequence
- 335. Self Crossing
- 336. Palindrome Pairs
- 337. House Robber III
- 338. Counting Bits
- 339. Nested List Weight Sum
- 34. Search for a Range
- 340. Longest Substring with At Most K Distinct Characters
- 341. Flatten Nested List Iterator
- 342. Power of Four
- 343. Integer Break
- 344. Reverse String
- 345. Reverse Vowels of a String
- 346. Moving Average from Data Stream
- 347. Top K Frequent Elements
- 348. Design Tic-Tac-Toe
- 349. Intersection of Two Arrays
- 35. Search Insert Position
- 350. Intersection of Two Arrays II
- 352. Data Stream as Disjoint Intervals
- 354. Russian Doll Envelopes
- 355. Design Twitter
- 357. Count Numbers with Unique Digits
- 359. Logger Rate Limiter
- 36. Valid Sudoku
- 360. Sort Transformed Array
- 361. Bomb Enemy
- 363. Max Sum of Rectangle No Larger Than K
- 364. Nested List Weight Sum II
- 365. Water and Jug Problem
- 366. Find Leaves of Binary Tree
- 367. Valid Perfect Square
- 368. Largest Divisible Subset
- 369. Plus One Linked List
- 370. Range Addition
- 371. Sum of Two Integers
- 372. Super Pow
- 373. Find K Pairs with Smallest Sums
- 374. Guess Number Higher or Lower
- 375. Guess Number Higher or Lower II
- 376. Wiggle Subsequence
- 377. Combination Sum IV
- 378. Kth Smallest Element in a Sorted Matrix
- 379. Design Phone Directory
- 38. Count and Say
  - s1.cpp
- 380. Insert Delete GetRandom O(1)
- 381. Insert Delete GetRandom O(1) - Duplicates allowed
- 382. Linked List Random Node
- 383. Ransom Note
- 384. Shuffle an Array
- 385. Mini Parser
- 386. Lexicographical Numbers
- 387. First Unique Character in a String
- 388. Longest Absolute File Path
- 389. Find the Difference
- 39. Combination Sum
- 390. Elimination Game
- 391. Perfect Rectangle
- 392. Is Subsequence
- 393. UTF-8 Validation
- 394. Decode String
- 395. Longest Substring with At Least K Repeating Characters
- 396. Rotate Function
- 397. Integer Replacement
- 398. Random Pick Index
- 399. Evaluate Division
- 4. Median of Two Sorted Arrays
- 40. Combination Sum II
- 400. Nth Digit
- 401. Binary Watch
- 402. Remove K Digits
- 403. Frog Jump
- 404. Sum of Left Leaves
- 405. Convert a Number to Hexadecimal
- 406. Queue Reconstruction by Height
- 407. Trapping Rain Water II
- 408. Valid Word Abbreviation
- 409. Longest Palindrome
- 41. First Missing Positive
- 410. Split Array Largest Sum
- 412. Fizz Buzz
- 413. Arithmetic Slices
- 414. Third Maximum Number
- 415. Add Strings
- 416. Partition Equal Subset Sum
- 417. Pacific Atlantic Water Flow
- 419. Battleships in a Board
- 42. Trapping Rain Water
- 420. Strong Password Checker
- 421. Maximum XOR of Two Numbers in an Array
- 422. Valid Word Square
- 423. Reconstruct Original Digits from English
- 424. Longest Repeating Character Replacement
- 427. Construct Quad Tree
- 429. N-ary Tree Level Order Traversal
- 43. Multiply Strings
- 430. Flatten a Multilevel Doubly Linked List
- 432. All O`one Data Structure
- 434. Number of Segments in a String
- 435. Non-overlapping Intervals
- 436. Find Right Interval
- 437. Path Sum III
- 438. Find All Anagrams in a String
- 44. Wildcard Matching
- 440. K-th Smallest in Lexicographical Order
- 441. Arranging Coins
- 442. Find All Duplicates in an Array
- 443. String Compression
- 445. Add Two Numbers II
- 446. Arithmetic Slices II - Subsequence
- 447. Number of Boomerangs
- 448. Find All Numbers Disappeared in an Array
- 449. Serialize and Deserialize BST
- 45. Jump Game II
- 450. Delete Node in a BST
- 451. Sort Characters By Frequency
- 452. Minimum Number of Arrows to Burst Balloons
- 453. Minimum Moves to Equal Array Elements
- 454. 4Sum II
- 455. Assign Cookies
- 456. 132 Pattern
- 457. Circular Array Loop
- 459. Repeated Substring Pattern
- 46. Permutations
- 460. LFU Cache
- 461. Hamming Distance
- 462. Minimum Moves to Equal Array Elements II
- 463. Island Perimeter
- 464. Can I Win
- 466. Count The Repetitions
- 467. Unique Substrings in Wraparound String
- 468. Validate IP Address
- 47. Permutations II
- 470. Implement Rand10() Using Rand7()
- 471. Encode String with Shortest Length
- 472. Concatenated Words
- 473. Matchsticks to Square
- 474. Ones and Zeroes
- 475. Heaters
- 476. Number Complement
- 477. Total Hamming Distance
- 478. Generate Random Point in a Circle
- 48. Rotate Image
- 480. Sliding Window Median
- 481. Magical String
- 482. License Key Formatting
- 483. Smallest Good Base
- 485. Max Consecutive Ones
- 486. Predict the Winner
- 487. Max Consecutive Ones II
- 488. Zuma Game
- 489. Robot Room Cleaner
- 49. Group Anagrams
- 490. The Maze
- 491. Increasing Subsequences
- 492. Construct the Rectangle
- 494. Target Sum
- 495. Teemo Attacking
- 496. Next Greater Element I
- 497. Random Point in Non-overlapping Rectangles
- 498. Diagonal Traverse
- 5. Longest Palindromic Substring
- 50. Pow(x, n)
- 500. Keyboard Row
- 501. Find Mode in Binary Search Tree
- 502. IPO
- 503. Next Greater Element II
- 504. Base 7
- 506. Relative Ranks
- 507. Perfect Number
- 508. Most Frequent Subtree Sum
- 509. Fibonacci Number
- 513. Find Bottom Left Tree Value
- 515. Find Largest Value in Each Tree Row
- 516. Longest Palindromic Subsequence
- 517. Super Washing Machines
- 518. Coin Change 2
- 519. Random Flip Matrix
- 520. Detect Capital
- 521. Longest Uncommon Subsequence I
- 523. Continuous Subarray Sum
- 524. Longest Word in Dictionary through Deleting
- 525. Contiguous Array
- 526. Beautiful Arrangement
- 528. Random Pick with Weight
- 529. Minesweeper
- 53. Maximum Subarray
- 530. Minimum Absolute Difference in BST
- 532. K-diff Pairs in an Array
- 535. Encode and Decode TinyURL
- 536. Construct Binary Tree from String
- 537. Complex Number Multiplication
- 538. Convert BST to Greater Tree
- 539. Minimum Time Difference
- 54. Spiral Matrix
- 540. Single Element in a Sorted Array
- 541. Reverse String II
- 542. 01 Matrix
- 543. Diameter of Binary Tree
- 544. Output Contest Matches
- 546. Remove Boxes
- 547. Friend Circles
- 549. Binary Tree Longest Consecutive Sequence II
- 55. Jump Game
- 551. Student Attendance Record I
- 552. Student Attendance Record II
- 553. Optimal Division
- 554. Brick Wall
- 556. Next Greater Element III
- 557. Reverse Words in a String III
- 558. Quad Tree Intersection
- 559. Maximum Depth of N-ary Tree
- 560. Subarray Sum Equals K
- 561. Array Partition I
- 562. Longest Line of Consecutive One in Matrix
- 563. Binary Tree Tilt
- 565. Array Nesting
- 566. Reshape the Matrix
- 567. Permutation in String
- 57. Insert Interval
- 570. Managers with at Least 5 Direct Reports
- 572. Subtree of Another Tree
- 575. Distribute Candies
- 576. Out of Boundary Paths
- 577. Employee Bonus
- 58. Length of Last Word
- 581. Shortest Unsorted Continuous Subarray
- 582. Kill Process
- 583. Delete Operation for Two Strings
- 584. Find Customer Referee
- 586. Customer Placing the Largest Number of Orders
- 589. N-ary Tree Preorder Traversal
- 59. Spiral Matrix II
- 590. N-ary Tree Postorder Traversal
- 591. Tag Validator
- 593. Valid Square
- 594. Longest Harmonious Subsequence
- 595. Big Countries
- 597. Friend Requests I: Overall Acceptance Rate
- 598. Range Addition II
- 599. Minimum Index Sum of Two Lists
- 6. ZigZag Conversion
- 60. Permutation Sequence
- 600. Non-negative Integers without Consecutive Ones
- 603. Consecutive Available Seats
- 604. Design Compressed String Iterator
- 605. Can Place Flowers
- 606. Construct String from Binary Tree
- 607. Sales Person
- 609. Find Duplicate File in System
- 61. Rotate List
- 610. Triangle Judgement
- 611. Valid Triangle Number
- 613. Shortest Distance in a Line
- 616. Add Bold Tag in String
- 617. Merge Two Binary Trees
- 62. Unique Paths
- 620. Not Boring Movies
- 621. Task Scheduler
- 622. Design Circular Queue
- 623. Add One Row to Tree
- 627. Swap Salary
- 628. Maximum Product of Three Numbers
- 629. K Inverse Pairs Array
- 63. Unique Paths II
- 632. Smallest Range Covering Elements from K Lists
- 636. Exclusive Time of Functions
- 637. Average of Levels in Binary Tree
- 638. Shopping Offers
- 639. Decode Ways II
- 64. Minimum Path Sum
- 640. Solve the Equation
- 641. Design Circular Deque
- 643. Maximum Average Subarray I
- 645. Set Mismatch
- 646. Maximum Length of Pair Chain
- 647. Palindromic Substrings
- 648. Replace Words
- 65. Valid Number
- 650. 2 Keys Keyboard
- 651. 4 Keys Keyboard
- 652. Find Duplicate Subtrees
- 653. Two Sum IV - Input is a BST
- 654. Maximum Binary Tree
- 655. Print Binary Tree
- 657. Robot Return to Origin
- 659. Split Array into Consecutive Subsequences
- 66. Plus One
- 661. Image Smoother
- 662. Maximum Width of Binary Tree
- 663. Equal Tree Partition
- 664. Strange Printer
- 665. Non-decreasing Array
- 666. Path Sum IV
- 667. Beautiful Arrangement II
- 668. Kth Smallest Number in Multiplication Table
- 669. Trim a Binary Search Tree
- 67. Add Binary
- 670. Maximum Swap
- 671. Second Minimum Node In a Binary Tree
- 673. Number of Longest Increasing Subsequence
- 674. Longest Continuous Increasing Subsequence
- 676. Implement Magic Dictionary
- 677. Map Sum Pairs
- 678. Valid Parenthesis String
- 680. Valid Palindrome II
- 682. Baseball Game
- 684. Redundant Connection
- 686. Repeated String Match
- 687. Longest Univalue Path
- 688. Knight Probability in Chessboard
- 69. Sqrt(x)
- 690. Employee Importance
- 693. Binary Number with Alternating Bits
- 694. Number of Distinct Islands
- 695. Max Area of Island
- 696. Count Binary Substrings
- 697. Degree of an Array
- 698. Partition to K Equal Sum Subsets
- 699. Falling Squares
- 7. Reverse Integer
- 254 entries not shown
lib
notes
system-design
.gitignore
README.md
checkin.sh
create.sh
readme.sh

38. Count and Say

lzl124631x

38 | Count and Say | Easy

Jan 21, 2017

f965e60 · Jan 21, 2017

History

This branch is 2352 commits behind lzl124631x/LeetCode:master.

Name	Name	Last commit message	Last commit date
parent directory ..
s1.cpp	s1.cpp	38 \| Count and Say \| Easy	Jan 21, 2017

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