How to solve core dumped problen while debugging code with gdb

This following code segment I ain't able to debug. The output is saying that

Aborted (core dumped) [1] + Aborted (core dumped) "/bin/gdb" --interpreter=mi --tty=${DbgTerm} 0<"/tmp/Microsoft-MIEngine-In-kgwsird3.a0t" 1>"/tmp/Microsoft-MIEngine-Out-j3ssuqn2.lsi"

'''Note that, I am using gdb in Linux and using Visual Studio as code editor.'''

#include <iostream>

int main() {
    int tt;
    std::cin >> tt;
    while(tt--) {
    int n;
    std::cin >> n;
    int h, m;
    std::cin >> h >> m;
    int time = 60 * h + m, ans = 24 * 60;
    for(int i = 0; i < n; ++i) {
        std::cin >> h >> m;
        int t = 60 * h + m - time;
        if(t < 0) t += 24 * 60;
        ans = (ans < t ? ans : t);
    }
    std::cout << ans / 60 << " " << ans % 60 << '\n';
}
    return 0;
}