#include<iostream> #include<stack> using namespace std; int main(){ int t; cin>>t; while(t--){ stack<char> sta; string s; cin>>s; bool isLegal=true; for(int i=0;i<s.length();++i){ if(s[i]=='('){ sta.push(s[i]); } else if(s[i]==')'){ if(!sta.empty() && sta.top()=='('){ sta.pop(); } else { isLegal=false; break; } } } if(!sta.empty()){ isLegal=false; } if(isLegal){ cout<<"Yes"<<endl; } else { cout<<"No"<<endl; } } return 0; } |
Double click to view unformatted code.