int do_dup(int a[],int N)
{
char* flag = new char[256], result = -1;
for(int i = 0; i < N; i++)
flag[i] = 0;
for(i = 0; i < N; i++)
{
if(flag[a[i]] == 0)
flag[a[i]] = 1;
else
{
result = a[i];
printf("%d\n",a[i]);
}
}
delete[]flag;
}
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