OJ Board

#include <stdio.h>
#include <stdlib.h>
int compare(const void *a, const void *b)
{
return ( *(int*)a - *(int*)b );
}
int main()
{
int in[100000];
int N,i,j,result,flag = 0;
while(scanf("%d",&N)==1)
{
if(flag == 1)
printf("\n");
flag = 1;
for(i=0;i<N;i++)
{
scanf("%d",&in[i]);
}
qsort ...

could anyone tell me why i'm getting WA ?
thank you in advance

#include <stdio.h>
#include <string.h>
int div_4(char a[])
{
int i,remainder = 0;
for(i=0;a[i]!=0;i++)
{
remainder = (remainder*10 + a[i]-48)%4;
}
if(remainder == 0)
return 1;
else
return 0;
}
int div_15(char a[])
{
int i ...