NHAY_SPOJ

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
int main()
{
int i,j,n,t;

int len;
while((scanf("%d",&len))==1)
{
char str[1000000],sub[len+3];

int check[len];
int k=0;
char t_c;
int slen,start;
    //cin>>len;
    i=0;
    getchar();
    while((t_c=cin.get())!='\n')
    {
    sub[i++]=t_c;

    }
    sub[i]='\0';
    i=0;

    while((t_c=cin.get())!='\n')
    {
    str[i++]=t_c;
    }
    str[i]='\0';

    int done=0;
    slen=strlen(str);
    for(i=0;i<slen-len+1;i++)
    {
    if(str[i]==sub[0] && str[i+len-1]==sub[len-1])
    check[k++]=i;
    }
    for(i=0;i<k;i++)
    {
    int p=0;
    int fl=0;
    start=check[i];
    for(j=start;j<start+len;j++)
    {

    if((str[j]-sub[p])!=0)
    {
    fl=1;
    //cout<<"canel j "<<j<<"  p "<<p<<"str "<<str[j]<<" "<<sub[p]<<"diff "<<(str[j]-sss[p])<<"\n";
    break;
    }
    else
    p++;
    }
    if(fl==0)
    {
    cout<<check[i]<<"\n";
    done=1;
    }
    }
    if(!done)
    cout<<"\n";


}
}