题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5019
3 2 3 1 2 3 2 8 16 3
1 -1 2
官方题解:
代码如下:
#include <cstdio>
#include <cstring>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
typedef __int64 LL;
vector<LL>v;
LL GCD(LL a, LL b)
{
if(b == 0)
return a;
return GCD(b,a%b);
}
int main()
{
int t;
LL x, y, k;
scanf("%d",&t);
while(t--)
{
v.clear();
scanf("%I64d%I64d%I64d",&x,&y,&k);
LL tt = GCD(x,y);
// printf("%I64d\n",tt);
for(LL i = 1; i*i <= tt; i++)
{
if(tt%i == 0)
{
v.push_back(i);
if(i*i != tt)//防止放入两个i
v.push_back(tt/i);
}
}
sort(v.begin(), v.end());
if(k > v.size())
printf("-1\n");
else
printf("%I64d\n",v[v.size()-k]);
}
return 0;
}原文地址:http://blog.csdn.net/u012860063/article/details/39403953