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,m;
    cin>>n>>m;
    vector<long long>a(n+1),diff(n+1,0),prefix(n+1,0);
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }

    while(m--){
        long long l,r,k;
        cin>>l>>r>>k;
        diff[l] += k;
        if(r + 1 <= n) {
            diff[r+1] -= k;
        }
    }

    for(int i = 1; i <= n; i++){
        prefix[i] = prefix[i-1] + diff[i];
    }

    for(int i=1;i<=n;i++){
        cout<<a[i]+prefix[i]<<" ";
    }

    return 0;
}