Problem Description
Find the biggest integer n (1 <= n <= N) and an integer x to make them satisfy

Input
The input consists of several test cases. Each test case contains a integer N, 1<=N<=10^18.The input ends with N = 0.

Output
In one line for each case, output two integers n and x you have found.

Sample Input
1
2
0

Sample Output
1 1
1 1

2个回答

int mun=0
for(int i = 1,i<=n,i++)
{mun=mun+i^2}
x^2=mun/n;

``````#include <stdio.h>
#include<iostream>
using namespace std;
int main()
{
long long i,j,k;
long long N,n,x,sumn2;

cin>>N;
while(N!=0)
{
n = 0;
x = 0;
for(i=N;i>0;i--)
{
sumn2 = 0;
for(j=1;j<=i;j++)
sumn2 += j*j;
if(sumn2%i==0)
{
k = sumn2 / i;
x = sqrt(double(k));
if(x*x == k)
{
n = i;
break;
}
}
}
cout<<"n="<<n<<"    x="<<x<<endl;
//cout<<k<<endl;
//cout<<x*x<<endl;
cin>>N;
}
return 0;
}
``````

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