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balaccedParanth.cpp
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51 lines (50 loc) · 1.11 KB
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#include<iostream>
#include<bits/stdc++.h>
using namespace std;
bool isValid(string s)
{
int n=s.length();
stack<char>st;
bool ans=false;
for(int i=0;i<n;i++){
if(s[i]=='(' || s[i]=='{' || s[i]=='[')
st.push(s[i]);
else if(!st.empty() && s[i]==')'){
if(st.top()=='(')
st.pop();
else{
ans=false;
break;
}
}
else if(!st.empty() && s[i]=='}'){
if(st.top()=='{')
st.pop();
else{
ans=false;
break;
}
}
else if(!st.empty()&&s[i]==']'){
if(st.top()=='[')
st.pop();
else if(st.top()==']')
ans=false;
else{
ans=false;
break;
}
}
}
if(!st.empty())
return false;
return ans;
}
int main(){
string s="}";
if(isValid(s))
cout<<"Valid String"<<endl;
else
cout<<"Invalid String"<<endl;
return 0;
}