HDU 4627 The Unsolvable Problem 解题心得

#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
using namespace std;



        

int main()
{
    int t;
    cin >> t;
    while (t--){
        __int64  n;
        cin >> n;
        __int64   ans = 0;
        if (n % 2 == 0){
            if (n == 2) 
                ans = 1;
            else{
                if ((n / 2) % 2 == 0){
                    ans = (((n / 2) - 1)* (n / 2 + 1));
                }
                else{
                        ans = (((n / 2) - 2)* (n / 2 + 2));
                }
            }
        }
        else{
            ans = (n / 2 * ((n / 2) + 1));
        }
        cout << ans << endl;
    }


    return 0;
}