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4949.cpp
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51 lines (41 loc) · 1.01 KB
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#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <stack>
using namespace std;
string s;
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0),cout.tie(0);
getline(cin,s);
while(s != "."){
int flag = true;
stack<char> st;
for(int i=0 ; i<s.size() ; i++){
if(s[i] == '(' || s[i] == '['){
st.push(s[i]);
}
if(s[i] == ')'){
if(!st.empty() && st.top() == '('){
st.pop();
}else {
flag = false;
break;
}
}
if(s[i] == ']'){
if(!st.empty() && st.top() == '['){
st.pop();
}else {
flag = false;
break;
}
}
}
if(st.empty() && flag) cout << "yes\n";
else cout << "no\n";
s.clear();
getline(cin,s);
}
}