已经A了
by Kcyzy @ 2018-10-14 20:23:05
```cpp
#include <iostream>
using namespace std;
int main(){
int ans=0;
char t;
while(cin>>t){
if(t=='@') break;
if(t=='(') ans++;
else if(t==')'&&ans>0) ans--;
else if(t==')'&&ans==0){
//针对第三个点())()@
//如果在左括号前出现有括号
//ans--退出循环
ans--;
break;
}
}
if(ans!=0) cout<<"NO"<<endl;
else cout<<"YES"<<endl;
return 0;
}
```
by Kcyzy @ 2018-10-14 20:25:17
QAQ...
by 其实我是蒟蒻 @ 2018-12-03 21:33:48