HDU 1017

Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u

Submit Status Practice HDU 1017

Description

Given two integers n and m, count the number of pairs of integers (a,b) such that 0 < a < b < n and (a^2+b^2 +m)/(ab) is an integer. 

This problem contains multiple test cases! 

The first line of a multiple input is an integer N, then a blank line followed by N input blocks. Each input block is in the format indicated in the problem description. There is a blank line between input blocks. 

The output format consists of N output blocks. There is a blank line between output blocks. 

 

Input

You will be given a number of cases in the input. Each case is specified by a line containing the integers n and m. The end of input is indicated by a case in which n = m = 0. You may assume that 0 < n <= 100. 

 

Output

For each case, print the case number as well as the number of pairs (a,b) satisfying the given property. Print the output for each case on one line in the format as shown below. 

 

Sample Input

110 120 330 40 0 

 

Sample Output

Case 1: 2Case 2: 4
Case 3: 5 
简单的数论题，判断a能不能整除b，a%b==0即可
#include <iostream>#include <stdio.h>using namespace std;int main(){    int N;    scanf("%d",&N);    while(N--)    {        int icase=0;        int n,m;        while(scanf("%d%d",&n,&m))        {            if(n==0&&m==0) break;            icase++;int cnt=0;            for(int b=2;b<n;b++)            {                for(int a=1;a<b;a++)                {                    if((a*a+b*b +m)%(a*b)==0)                    {                        cnt++;                    }                }            }            cout<<"Case "<<icase<<": "<<cnt<<endl;        }        if(N>0) cout<<endl;    }    return 0;}