@[lij123](/user/1037981) minn改为极大值，以及b数组原本就有值，不能直接差分，记到另一个数组里。
by free_fall @ 2023-08-28 07:08:34
改成这样
```
#include<bits/stdc++.h>
using namespace std;
int n,a[5000001],s[5000001],b[5000001],c[5000001],q;
int main(){
int n,m,minn=10000000;
cin>>n>>m;
for(int i=1;i<=n;i++){
int x;
cin>>x;
b[i]=x;
}
for(int i=1;i<=m;i++){
int l,r,w;
cin>>l>>r>>w;
c[l]+=w;
c[r+1]-=w;
}
for(int i=1;i<=n;i++){
s[i]=s[i-1]+c[i];
b[i]+=s[i];
minn=min(b[i],minn);
}
cout<<minn;
}
```
by free_fall @ 2023-08-28 07:10:20
明白了
by lij123 @ 2023-08-28 07:10:21