套题 Codeforces Round #277 (Div. 2)

A. Calculating Function

水题，分奇数偶数处理一下就好了

#include<stdio.h>
#include<iostream>
using namespace std;
int main()
{
    long long n;scanf("%lld",&n);
    if(n%2==1) printf("%lld\n",(n-1LL)/2LL - n);
    else printf("%lld\n",n/2LL);
}

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