Alien Invasion II

#include <iostream>

using namespace std;

int main()
{
    long arr[100][100];
    long n, m;
    cin >> n;
    cin >> m;
    for (long i = 0; i < m; i++) {
        long a, b, x;
        cin >> a;
        cin >> b;
        cin >> x;
        for (long k = 0; k <= b - a; k += 1) {
            arr[a + k - 1][i] = x + k;
        }
    }
    for (long i = 0; i < n; i++) {
        long mx = 0;
        for (long j = 0; j <= m; j++) {
            if (arr[i][j] > mx) mx = arr[i][j];
        }
        cout << mx;
        if (i != n - 1) cout << " ";
    }
    cout << endl;
    return 0;
}

Test 1

Verdict: RUNTIME ERROR

Test 2

Verdict: RUNTIME ERROR

Test 3

Verdict: RUNTIME ERROR