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气死人呀,用数学方法做了n久也木成功,结果试试暴力,碰上运气了暴力法:
#include <iostream>
#include <cmath>
#include <map>
#include <cstdio>
using namespace std;
typedef __int64 LL;
const LL M = 2147483649;
map<LL,LL> G;
LL pows(LL a,LL b)
{
LL result = 1;
while(b--)
{
result *= a;
}
return result;
}
void init()
{
for(LL i=2;i<=200000;i++)
{
for(int k=0;k<2;k++)
{
i = - i;
for(LL j=2;j<=31;j++)
{
LL temp = pows(i,j);
if(temp>M||temp<-M)break;
if(G[temp]==0)G[temp]=j;//这个其实很缺陷
}
}
}
}
int main()
{
init();
int n;
while(cin>>n)
{
if(n==0)break;
LL en = G[(LL)n];//同样很缺陷!!!
if(en==0)puts("1");
else printf("%I64d\n",en);
}
return 0;
}
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