#include <iostream>
#include <cstring>

using namespace std;



void kmp_t(const char * s, int *t)
{
    int len = strlen(s);

    if(len<=2){
        t[0]=-1; t[1]=0;
    }
    else{
        t[0]=-1; t[1]=0;

        int temp1,temp2;
        temp1 = 2; temp2 = 0;

        while(temp1<len){
            if(s[temp1-1] == s[temp2]){
                temp2++;
                t[temp1] = temp2;
                temp1++;
            }
            else if(temp2)
                temp2 = t[temp2];
            else{
                t[temp1] = 0;
                temp1++;
            }
        }

    }
    for(int i=0;i<len;i++)
    {
        cout<<s[i]<<" "<<t[i]<<endl;
    }

}

int kmp(const char * s1, const char *s2, int *t){
    int len1 = strlen(s1);
    int len2 = strlen(s2);
    int m1=0, m2=0;
    while(m1+m2<len1){
        cout<<m1<<" "<<m2<<endl;
        if(s1[m1+m2] == s2[m2]){
            m2++;
            if(m2>=len2){return m1;}
        }
        else{
            if(t[m2]==-1){
                m1 += 1;
                m2 = 0;
            }
            else{
                m1 += m2-t[m2];
                m2 = t[m2];
            }
        }
    }
    return -1;
}

int main()
{
    const char *s1; s1 = "ababctabfdabababcdab";
    const char *s2; s2 = "ababcd";

    int *t = new int[strlen(s2)];
    int n_start;

    fill(t,t+strlen(s2),0);

    kmp_t(s2,t);
    n_start = kmp(s1,s2,t);
    cout<<n_start<<endl;
    for(int i=0; i<strlen(s1); i++)
    {
        if(i==n_start)cout<<" || ";
        if(i==n_start+strlen(s2))cout<<" || ";
        cout<<s1[i]<<" ";
    }

    return 0;
}