题解 | 【模板】差分

#include <iostream>
#include<vector>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n,q;
    cin>>n>>q;
    vector<long long>a(n+2);
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    vector<long long>diff(n+2,0);
    for(int i=1;i<=n;i++){
        diff[i]=a[i]-a[i-1];
    }
    while(q--){
        int l,r,d;
        cin>>l>>r>>d;
        diff[l]+=d;
        if(r+1<=n)diff[r+1]-=d;
    }
    vector<long long>res(n+2);
    res[0]=0;
    for(int i=1;i<=n;i++){
        res[i]=res[i-1]+diff[i];
    }
    for(int i=1;i<=n;i++){
        cout<<res[i]<<" ";
    }
    cout<<endl;
    return 0;
}
// 64 位输出请用 printf("%lld")