Here you will find solutions of many problems on spoj. If you want solution of some problem which is not listed in blog or have doubt regarding any spoj problem (which i have solved) or any programming concept (data structure) you can mail me @ raj.nishant360@gmail.com
And my humble request to you all that don't copy the code only try to understand the logic and algorithm behind the code. I have started this because if you tried as hard as you can and still can't find any solution to the problem then you can refer to this.
You can read my answer how to start competitive programming CLICK HERE

Sunday, October 5, 2014

FILRTEST-File Recover Testing

File Recover Testing

Below given code is for filrtest spoj or file recover testing spoj.

Hint:-  For solving this question you should Know z-function . If you know z-function of a string then its very to calculate the number of string in given length.


#include <bits/stdc++.h>
using namespace std;
int *Z_function(char s[])
{
    int *z;
    z = (int*)calloc((strlen(s)+9),sizeof(int));
    int l=0,r=0,n = strlen(s);
    z[0] = n;
    for(int i=1;i<n;i++)
    {
        if(i<=r)
            z[i] = min(r-i+1 , z[i-l]);
        while(i+z[i] < n && s[z[i]] == s[i+z[i]])
            z[i]++;
        if(i+z[i]-1 > r)
            l = i, r = i+ z[i] - 1;
    }
    return z;
}
int main()
{
    int n;
    while(1)
    {
        char s[1000009];
        scanf("%d",&n);
        scanf("%s",s);
        if(n==-1)
            return 0;
        int *z;
        int size = strlen(s);
        if(n<size)
        {
            printf("0\n");
            continue;
        }
        z = (int*)calloc((size+9),sizeof(int));
        z = Z_function(s);
        int m = 0;
        for(int i=1;i<size;i++)
        {
            if(i+z[i] == size)
                m = max(m , z[i]);
        }
        int total;
        total = (n-m)/(size - m);
        printf("%d\n",total);
    }
    return 0;
}