cs.cpp

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*/                              
#include<bits/stdc++.h>
using namespace std;
 
#define fastio ios_base::sync_with_stdio(0); cin.tie(0)
#define LL long long 
#define mod 1000000007 
#define FOR(i, j, k) for (int i=j ; i<k ; i++)
#define ROF(i, j, k) for (LL i=j ; i>=k ; i--) 
#define debug(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false); debug("%s time : %.4fs", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))

const long long INF = 1e18;
const long long MAX = 1e5+10;
int main(){
    fastio;
    int t=1; cin>>t;
    while(t--){
        LL x,y,l,r,z=0; cin>>x>>y>>l>>r;
        LL len = 62;
        while(len>=0){
            if(x&(1ll<<len) == y&(1ll<<len) && y&(1ll<<len) >0 ) {
                z=z | (1ll<<len);
            }else break;
            len--;
        }   vector<LL>res; res.push_back(l);res.push_back(r);
        while(len>=0){
            if( r&(1ll<<len) ) res.push_back(z+(1ll<<len) -1);
            z+=r&(1ll<<len);
            len--;
        }sort(res.begin(),res.end());
        FOR(i,0,res.size()) 
            if((x&res[i])*(y&res[i]) > (x&z)*(y&z) ) z=res[i];

        ROF(i,62,0) {
            if((z&(1ll<<i))>0 && (x&(1ll<<i))==0 && (y&(1ll<<i))==0 && z - (1ll<<i) >=l )
                z = z-(1ll<<i);
        }
        cout<<z<<"\n";

    }
}