does anyone knows what am I doing wrong???

here's my code in C.

#include <stdio.h>

int main()
{
       long N,i,j;

       long ID[150000];

       int M[150000];

       scanf("%ld",&N);

       for (i=0;i<N;i++){
           scanf("%ld %d",&ID[i],&M[i]);
       }

       for (i=100;i>=0;i--){
           for (j=0;j<N;j++){
               if (M[j] == i){
                  printf("%ld %d\n",ID[j],M[j]);
               }
           }
       }

       return 0;
}

Dynamic allocation , is the way.