代码如下

#include<bits/stdc++.h>
using namespace std;
const int mmmm=5e6; 
int n,m,a[mmmm],x,y,z,c[mmmm],b[mmmm];
int main(){
	cin>>n>>m; 
	for(int i=1;i<=n;i++){
		cin>>a[i];
		c[i]=a[i]-a[i-1];
	}
	for(int i=1;i<=m;i++){
		cin>>x>>y>>z;
		c[x]+=z;
		c[y+1]-=z;
	} 
	int minn=9999999;
	for(int i=1;i<=n;i++){
		b[i]=b[i-1]+c[i];
		if(minn>b[i]){
			minn=b[i];
		}
	}
	cout<<minn;
    return 0;
}