为什么会超时

rt,样例是能过的，感觉写的差分没啥问题，但是全TLE

#include <bits/stdc++.h>
using namespace std;
inline int read(){
    int x = 0,f = 1;
    char c = getchar();
    while (!isdigit(c)){
        if (c == '-'){
            f = -1;
            c = getchar();
        }
    }
    while (isdigit(c)){
        x = x*10+c-'0';
        c = getchar();
    }
    return x*f;
}
int a[100100],d[100100];
signed main(){
    int ans = 101111;
    int n = read(),p = read();
    for (int i=1;i<=n;i++){
        a[i] = read();
    }
    for (int i=1;i<=n;i++){
        d[i] = a[i]-a[i-1];
    }
    for (int i=0;i<p;i++){
        int x = read(),y = read(),z = read();
        d[x]+=z;
        d[y+1]-=z;
    }
    for (int i=1;i<=n;i++){
        a[i] = a[i-1]+d[i];
        if (ans>a[i]){
            ans = a[i];
        }
    }
    cout<<ans<<endl;
    return 0;
}