ABC072A - Sandglass2

問題：A - Sandglass2

#include <algorithm>
#include <iostream>
using namespace std;

int main(void) {
    int x, t;

    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> x >> t;
    cout << max(0, x - t) << "\n";
    return 0;
}