CF1248A Integer Points

CF1248A Integer Points

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思路

画图模拟一下可以发现就是奇数和奇数的会整点相交，偶数的和偶数的会整点相交。

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AC代码

#include <bits/stdc++.h>
using namespace std;
#define int long longsigned main()
{ios::sync_with_stdio(false);cin.tie(0);int t;cin >> t;while (t--){int n, neven = 0;cin >> n;for (int i = 0; i < n; i++){int x;cin >> x;if (x % 2 == 0){neven++;}}int m, meven = 0;cin >> m;for (int i = 0; i < m; i++){int y;cin >> y;if (y % 2 == 0){meven++;}}cout << (neven * meven) + (n - neven) * (m - meven) << '\n';}
}