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/*

* edit distance of two strings

*

* Algorithm:

* - recursive:

*/

#include <iostream>

#include <cstring>

using namespace std;

int edit_distance(char a[], int len_a, char b[], int len_b)

{

if (len_a==0)

return len_b;

if (len_b==0)

return len_a;

int dist;

if (a[len_a-1]==b[len_b-1])

dist = 0;

else

dist = 1;

int d1, d2, d3;

d1 = edit_distance(a,len_a-1, b, len_b)+1;

d2 = edit_distance(a,len_a, b, len_b-1)+1;

d3 = edit_distance(a, len_a-1, b, len_b-1) + dist;

return min(d1, min(d2,d3));

}

int main()

{

char a[] = "bcd";

char b[] = "acef";

cout << "Edit distance is: "

<< edit_distance(a, strlen(a), b, strlen(b)) << endl;

return 0;

}