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levenshtein.cc
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levenshtein.cc
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//*********************************************************************************
//
// levenshtein.cc
//
// Created by Pingfeng on 04/06/19.
//
// Description:
//
//*********************************************************************************
#include "levenshtein.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <cstring>
int levenshtein_distance(const char *src, const size_t src_len, const char *dst, const size_t dst_len) {
assert(src != NULL && dst != NULL);
if (src == dst) {
return 0;
} else if (src_len == 0) {
return dst_len;
} else if (dst_len == 0) {
return src_len;
}
int d[src_len + 1][dst_len + 1];
for (size_t i = 0; i < src_len + 1; i++) d[i][0] = i;
for (size_t j = 0; j < dst_len + 1; j++) d[0][j] = j;
for (size_t i = 1; i < src_len + 1; i++) {
for (size_t j = 1; j < dst_len + 1; j++) {
#define min(a, b) ((a) < (b) ? (a) : (b))
d[i][j] = min(min(d[i-1][j], d[i][j-1]) + 1, d[i-1][j-1] + (src[i-1] == dst[j-1] ? 0 : 1));
#undef min
}
}
return d[src_len][dst_len];
}
int main(int argc, char **argv) {
const char str1[] = "abcde";
const char str2[] = "ab2efg";
const char str3[] = "";
int dist0 = levenshtein_distance(str1, strlen(str1), str2, strlen(str2));
int dist1 = levenshtein_distance(str2, strlen(str2), str1, strlen(str1));
int dist2 = levenshtein_distance(str1, strlen(str1), str3, strlen(str3));
int dist3 = levenshtein_distance(str3, strlen(str3), str1, strlen(str1));
int dist4 = levenshtein_distance(str1, strlen(str1), str1, strlen(str1));
printf("edit_dist of '%s' and '%s' is: %d \n", str1, str2, dist0);
printf("edit_dist of '%s' and '%s' is: %d \n", str2, str1, dist1);
printf("edit_dist of '%s' and '%s' is: %d \n", str1, str3, dist2);
printf("edit_dist of '%s' and '%s' is: %d \n", str3, str1, dist3);
printf("edit_dist of '%s' and '%s' is: %d \n", str1, str1, dist4);
}