hdu 2058(收藏)

 #include<cstdio>
#include<cmath>
int main()
{
    int n,m,i,j;
    while(scanf("%d%d",&n,&m))
    {
        if(n==0||m==0)break;
        int len=sqrt((double)(m)*2.0);
        while(len)
        {
            int a=m/len-(len-1)/2;
            int b;
            if(a*len+(len-1)*len/2==m)
            {
                printf("[%d,%d]\n",a,a+len-1);
            }
            len--;
        }printf("\n");
    }
    return 0;
}