The sum problem
Total Submission(s): 23826 Accepted Submission(s): 7082
#include <stdio.h>
#include <math.h>
void print(long long int x,long long int y)
{
printf ("[%lld,%lld]\n",x,y);
}
int main()
{
long long int N,M,i,j,a1;
while (scanf("%lld%lld",&N,&M),N!=0||M!=0)
{
j=(int)sqrt(2*M);
for (i=j;i>=1;i--)
{
a1=(int)((M-i*(i-1)/2)/i);
if (a1*i+i*(i-1)/2==M)
print(a1,a1+i-1);
}
printf ("\n");
}
return 0;
}