944. Delete Columns to Make Sorted

class Solution {
public:
    int minDeletionSize(vector<string>& strs) {
        int idx=strs[0].size();
        int cnt=0;
        int p=0;
        while(p<idx){
             for(int i=0;i<strs.size()-1;i++){
                if(strs[i][p]>strs[i+1][p]){
                    cnt++;
                    break;}
                } p++;
        }
       return cnt;
    }
};