2052. 棋盘上的车

#include <bits/stdc++.h>
using namespace std;
int a[11];
int main() {
    ios::sync_with_stdio(false);
    a[0] = 1;
    for (int i = 1; i < 11; i++) {
        a[i] = i * a[i - 1];
    }
    int n, m, k;
    long long ans = 1;
    while (cin >> n >> m >> k) {
        int mid;
        if (m > n) {
            mid = m;
            m = n;
            n = mid;
        }
        ans = a[n] / a[n-k] * (a[m] / (a[m - k] * a[k]));
        printf("%lld\n", ans);
    }
}