CF#524-B

题目链接

http://codeforces.com/contest/1080/problem/B

思路

数学规律题

代码

 1 #include<iostream>
 2 using namespace std;
 3 int main()
 4 {
 5     int n;
 6     while(cin >> n)
 7     {
 8         int l, r;
 9         while(n--)
10         {
11             int ans = 0;
12             cin >> l >> r;
13             if(l & 1)
14                 ans = ((r - l + 1) & 1) ? ((r - l) / 2 - r) : (r - l + 1) / 2;
15             else
16                 ans = ((r - l + 1) & 1) ? (-(r - l) / 2 + r) : (-(r - l + 1) / 2);
17             cout << ans << endl;
18         }
19     }
20     return 0;
21 }

 

转载于:https://www.cnblogs.com/friend-A/p/10021262.html