不过，也谢谢你！！

@刘鸣谦 我说的是倒数第二题

#include<bits/stdc++.h> using namespace std; int main() { int t; cin>>t; for(int i=1;i<=t;i++){ int x; cin>>x; string s,s2; while(x){ s.push_back(char(x%2+48)); x/=2; } s2=s; reverse(s.begin(),s.end()); if(s==s2){ cout<<"Yes"<<"\n"; s=" "; } else{ cout<<"No"<<"\n"; s=" "; } } return 0; }

ok