模板题，不解释代码及一般步骤。注意开动态数组和long long，注意下标范围是 [0,n+1] 到 [0,m+1]，所以要开大至少两位。

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
signed main()
{
    ios::sync_with_stdio(false), cin.tie(0);
    ll n, m, t;
    cin >> n >> m >> t;
    vector<vector<ll>> A(n + 2, vector<ll>(m + 2, 0)); // [0,n+1],[0,m+1]
    for (ll a, b, c, d, v; t--;)
    {
        cin >> a >> b >> c >> d >> v;
        A[a][c] += v;
        A[b + 1][c] -= v;
        A[a][d + 1] -= v;
        A[b + 1][d + 1] += v;
    }
    for (ll i = 1; i <= n; ++i)
    {
        for (ll j = 1; j <= m; ++j)
        {
            A[i][j] += A[i - 1][j] + A[i][j - 1] - A[i - 1][j - 1];
            cout << A[i][j] << ' ';
        }
        cout << '\n';
    }
    return 0;
}