模板题，不解释代码及一般步骤。注意开快读和long long。

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll mn = 1e5 + 10;
ll n, m, a[mn];
signed main()
{
    ios::sync_with_stdio(false), cin.tie(0);
    cin >> n >> m;
    for (ll l, r, v; m--;)
    {
        cin >> l >> r >> v;
        a[l] += v, a[r + 1] -= v;
    }
    for (ll i = 1; i <= n; ++i)
    {
        a[i] += a[i - 1];
        cout << a[i] << ' ';
    }
    return 0;
}