task 5( ds lab 4) 3rd sem

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string a;
    stack <char> s;
    cin>>a;
    int i,cnt=0;
    for(i=0; i<a.size(); i++)
    {

        if(a[i]=='('||a[i]=='{'||a[i]=='[')
        {
            s.push(a[i]);

            cnt++;

        }
        else if(a[i]==')'||a[i]=='}'||a[i]==']')
        {
            if((a[i]==')'&&s.top()=='(')||(a[i]=='}'&&s.top()=='{')||(a[i]==']'&&s.top()=='['))
            {

                cnt--;

                s.pop();


            }
        }
    }
    if(cnt==0)
        cout<<"Yes";
    else
        cout<<"No";
}