A Subtask Problem codechef solution in cpp

#include <iostream>
using namespace std;

int main() {
    int t;
    cin >> t;
    while (t--) {
        int n, k;
        cin >> n >> k;
        int a[n];
        for (int i = 0; i < n; i++) {
            cin >> a[i];
        }
        int minVal = a[0];
        for (int i = 1; i < n; i++) {
            if (a[i] < minVal) {
                minVal = a[i];
            }
        }
        int res = (k - minVal > 0) ? k - minVal : 0;
        cout << res << endl;
    }
    return 0;
}