int main(int argc, char** argv){
if(argc < 3){
printf("Usage: %s word1 word 2\n", argv[0]);
exit(1);
}
printf("The distance between %s and %s is %d.\n", argv[1], argv[2], editDist(argv[1], argv[2]));
return 0;
}
/* Driver program */
int
main()
{
char str1[] = "sunday";
char str2[] = "saturday";
int str1Length = sizeof(str1) / sizeof(str1[0]);
int str2Length = sizeof(str2) / sizeof(str2[0]);
memset(memo, -1 ,sizeof memo);
int minimum = editDist(str1, str2, str1Length, str2Length);
printf("%d\n", minimum);
return 0;
}
int
editDist(char str1[], char str2[], int m, int n)
{
/*
* If first string is empty, the only option is to
* insert all characters of second string into first
*/
if (m == 0) return n;
/*
* If second string is empty, the only option is to
* remove all characters of first string
*/
if (n == 0) return m;
/* If this state has already been computed, get its value */
if (memo[m][n] > -1) return memo[m][n];
/*
* If last characters of two strings are same, nothing
* much to do. Ignore last characters and get count for
* remaining strings.
*/
if (str1[m-1] == str2[n-1])
return memo[m][n] = editDist(str1, str2, m-1, n-1);
/*
* If last characters are not same, consider all three
* operations on last character of first string, recursively
* compute minimum cost for all three operations and take
* minimum of three values.
*/
return memo[m][n] = 1 + min ( editDist(str1, str2, m, n-1), /* Insert */
editDist(str1, str2, m-1, n), /* Remove */
editDist(str1, str2, m-1, n-1) /* Replace */
);
}