Why this code gives me error in hidden teste cases. please help bro

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Problem Name : Fair Elections Practice Coding Problem

#include <bits/stdc++.h>

#define int long long
using namespace std;

signed main() {
    // your code goes here
    int t;
    cin >> t;
    while (t--) {
        int n, m;
        cin >> n >> m;
        priority_queue < int > john; // max_heap
        priority_queue < int, vector < int > , greater < int >> jack; // min_heap
        int john_vote = 0;
        int jack_vote = 0;

        for (int i = 0; i < n; i++) {
            int x;
            cin >> x;
            john.push(x);
            john_vote += x;
        }

        for (int i = 0; i < m; i++) {
            int x;
            cin >> x;
            jack.push(x);
            jack_vote += x;
        }

        int ans = 0;
        while (john_vote <= jack_vote) {

            int john_ele = john.top();
            int jack_ele = jack.top();
            if (john_ele >= jack_ele) {
                break;
            }

            // For swapping
            john_vote = john_vote - john_ele + jack_ele;
            jack_vote = jack_vote - jack_ele + john_ele;
            john.pop();
            john.push(jack_ele);
            jack.pop();
            jack.push(john_ele);

            // for counting how much swaping need to win john
            ans++;

        }

        if (john_vote > jack_vote) {
            cout << ans << endl;
        } else {
            cout << -1 << endl;
        }
    }

    return 0;
}