前缀和不会写80求条

#include <bits/stdc++.h>
using namespace std;

const int N = 5e6 + 5;
int a[N];
int minn;

int main() {
    int n, p;
    cin >> n >> p;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    while (p--) {
        int x, y, z;
        cin >> x >> y >> z;
        for (int i = x; i <= y; i++) {
            a[i] += z;
        }
    }
    minn = INT_MAX;
        for (int i = 1; i <= n; i++) {
            minn = min(minn, a[i]);
        }
    cout << minn;
    return 0;
}

啊啊啊