C++ 代码

学到很多，这种构造的方法很有趣

#include <iostream>

using namespace std;

const int N = 100010;
int a[N] = { 0 }, b[N] = { 0 };
int n, m;

void insert(int l, int r, int c)
{
    b[l] += c;
    b[r + 1] -= c;
}

int main()
{
    scanf("%d%d", &n, &m);
    for (int i = 1; i <= n; i++)
    {
        scanf("%d", &a[i]);
    }
    for (int i = 1; i <= n; i++)
    {
        insert(i, i, a[i]);
    }
    while (m--)
    {
        int l, r, c;
        scanf("%d%d%d", &l, &r, &c);
        insert(l, r, c);
    }
    for (int i = 1; i <= n; i++)
        b[i + 1] += b[i];
    for (int i = 1; i <= n; i++)
        printf("%d ", b[i]);
    return 0;
}