#include<iostream> using namespace std; int n, m; int findans(int n, int m) { if (n == 0) return m; if (m == 0) return n % 3; return findans(n - 1, m) - findans(n, m - 1) +findans(n - 1, m - 1); } int main(){ cin >> n >> m; cout << findans(n, m) << endl; return 0; }
输入:5 6
输出: