【lightoj】-1294 Positive Negative Sign
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Positive Negative Sign
Description
Given two integers: n and m and n is divisible by 2m, you have to write down the first n natural numbers in the following form. At first take first m integers and make their sign negative, then take next m integers and make their sign positive, the next m integers should have negative signs and continue this procedure until all the nintegers have been assigned a sign. For example, let n be 12 and m be 3. Then we have
-1 -2 -3 +4 +5 +6 -7 -8 -9 +10 +11 +12
If n = 4 and m = 1, then we have
-1 +2 -3 +4
Now your task is to find the summation of the numbers considering their signs.
Input
Input starts with an integer T (≤ 10000), denoting the number of test cases.
Each case starts with a line containing two integers: n and m (2 ≤ n ≤ 109, 1 ≤ m). And you can assume that nis divisible by 2*m.
Output
For each case, print the case number and the summation.
Sample Input
2
12 3
4 1
Sample Output
Case 1: 18
Case 2: 2
这道题真的是一个忧伤的故事!!!呜呜,wa了六次,因为没有好好看题,虽然想多了吧,但是类型用的不对啊!!!看题啊!!!!
#include<cstdio>int main(){int t;int j=1;scanf("%d",&t);while(t--){long long n,m,y;long long z=0;scanf("%lld%lld",&n,&m);y=n/m;z=m*m*(y/2);printf("Case %d: %lld\n",j,z);j++;}return 0;}
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