Competitive_Programming/stack_queue_3.cpp at main · rahulroynipon/Competitive_Programming · GitHub

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#include <bits/stdc++.h>
using namespace std;

int main()
{

    int t;
    cin >> t;

    while (t--)
    {
        string x;
        cin >> x;

        if (x.length() % 2 == 1)
        {
            cout << "NO" << endl;
            continue;
        }

        stack<char> s;

        for (char i : x)
        {
            if (s.empty())
            {
                s.push(i);
            }
            else if (s.top() != i)
            {

                s.pop();
            }
            else
            {
                s.push(i);
            }
        }

        cout << (s.empty() ? "YES" : "NO") << endl;
    }

    return 0;
}