HDU1854 Q-Sequence

http://acm.hdu.edu.cn/showproblem.php?pid=1854

随手练习

 #include <bits/stdc++.h>
 using namespace std;
 int t;
 string s;
 int main(){
     scanf("%d",&t);
     while(t--){
         int flag=;
         int zero=;
         int one=;
         string s2;
         cin>>s2;
         int len=s2.length();
         for(int i=;i<len;i++){
             if(s2[i]==''){
                 zero++;
             }else{
                 if(zero==){
                     flag=;
                 }
                 zero--;
             }
         }
         if(flag) cout<<"No"<<endl;
         else{
             cout<<"Yes"<<endl;
         }
     }
     return ;
 }