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#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;
