#include<iostream>
#include<algorithm>
using namespace std;
int n, p, a[5000005],s[5000005];
int main()
{
    int minn = 1e9;
    cin >> n >> p;
    for(int i = 1; i <= n; i++) 
    {
        cin >> a[i];
        s[i] = a[i] - s[i - 1];
    }
    for(int i = 1; i <= p; i++)
    {
        int x, y, z;
        cin >> x >> y >>z;
        s[x] += z;
        s[y + 1] -= z;
    }
    for(int i = 1; i <= n; i++)
    {
        a[i] = a[i - 1] + s[i];
        minn = min(minn,a[i]);
    }
    cout << minn;
    return 0;
}

大佬们帮我看看哪里出错了，第一次手写的，和第一个题解差不多