HDU 4993 Revenge of ex-Euclid(数学题 暴力)

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=4993

Problem Description

In arithmetic and computer programming, the extended Euclidean algorithm is an extension to the Euclidean algorithm, which computes, besides the greatest common divisor of integers a and b, the coefficients of Bézout's identity, that is integers x and y such
that ax + by = gcd(a, b).

---Wikipedia

Today, ex-Euclid takes revenge on you. You need to calculate how many distinct positive pairs of (x, y) such as ax + by = c for given a, b and c.



Input

The first line contains a single integer T, indicating the number of test cases.

Each test case only contains three integers a, b and c.

[Technical Specification]

1. 1 <= T <= 100

2. 1 <= a, b, c <= 1 000 000



Output

For each test case, output the number of valid pairs.



Sample Input

2
1 2 3
1 1 4

Sample Output

1
3

Source

BestCoder Round #9

题意：

寻找ax+by = c有多少组解！

代码如下：

#include <cstdio>
#include <cmath>
int main()
{
    int t;
    int a,b,c;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d%d%d",&a,&b,&c);
        int k=0;
        for(int x = 1; x*a < c; x++)
        {
            if((c-a*x)%b == 0)
                k++;
        }
        printf("%d\n",k);
    }
    return 0;
}