python/TangDou/Topic/PrefixAndSuffix/P1083_0.cpp

#include <bits/stdc++.h>
using namespace std;
int n, m;
const int N = 1000010;
int r[N];
int main() {
    cin >> n >> m;
    // 每一天可租借教室数
    for (int i = 1; i <= n; i++) cin >> r[i];

    // 从哪天到哪天，借多少个
    for (int i = 1; i <= m; i++) {
        int d, s, t;
        cin >> d >> s >> t;
        // 从开始天到结束天
        for (int j = s; j <= t; j++) {
            r[j] -= d;      // 减去借走的教室数
            if (r[j] < 0) { // 小于0了！
                cout << -1 << endl
                     << i << endl;
                return 0;
            }
        }
    }

    cout << 0 << endl;
    return 0;
}