蓝桥杯 algo122 未名湖的烦恼 简单题

#include <iostream>

using namespace std;

int m, n, ans;

void solve(int m, int n, int cnt)
{
    if (m == 0 && n == 0)
    {
        ans++;
        return;
    }
    if (cnt > 0 && n > 0) solve(m, n-1, cnt-1);
    if (m > 0) solve(m-1, n, cnt+1);
}

int main(int argc, char const *argv[])
{
    cin >> m >> n;
    solve(m, n, 0);
    cout << ans;
    return 0;
}