HDU-2058 The sum problem

#include <iostream>
#include <stdio.h>
#include <math.h>
using namespace std;

int main()
{
int n,m;
int N;
int i,k;
while(scanf("%d %d",&n,&m)!=EOF)
{
if(n==0&&m==0)
break;
k=0;
N=sqrt(2*m);
for(i=N;i>=1;i--)
{
k=m-(i-1)*i/2;
if(k%i==0)
printf("[%d,%d]\n",k/i,k/i+i-1);
}
puts("");
}
return 0;
}