有大佬看看我这第二题算法有什么问题吗 ``` #include<bits/stdc++.h> using namespace std; int combine(int m, int n){ if(m == 1) return n; return n / m * combine(m - 1, n - 1); } int main(){ freopen("jindong2.txt","r",stdin); int n, evens = 0, odds = 0; cin >> n; vector<int> nums(n); for(int i = 0; i < n; i++){ cin >> nums[i]; if(nums[i] % 2 == 0) evens++; if(nums[i] % 2 == 1) odds++; } int res1 = 0, res2 = 0; for(int i = 2; i <= evens; i++){ res1 = (res1 + combine(i, evens)) % 1000000007; } for(int i = 2; i <= odds; i++){ res2 = (res2 + combine(i, evens)) % 1000000007; } cout << res1 + res2 << endl; } ```