Tell me please why I got Memory Limit Exeeded.

// problem 1100

#include<stdio.h>

long id[150001L];
int m[150001L];
long pr[101],i,j,n;

int main()
{
    scanf("%ld",&n);
    for(i=1;i<=n;i++)
    {
        scanf("%ld %d",&id[i],&m[i]);
        pr[m[i]]++;
    }
    for(i=100;i>=0;i--)
    {
        j=1;
        while(pr[i]!=0)
        {
            if(m[j]==i)
            {
                printf("%ld %d\n",id[j],m[j]);
                pr[i]--;
            }
            j++;
        }
    }
    return 0;
}

In fact, if you use C, you can use only a bit more than 700KB. For Pascalers, there's only 627KB.