Created
May 2, 2014 15:00
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levenshitein
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#include<stdio.h> | |
#include<string.h> | |
int min(int a, int b) { | |
return a<b?a:b; | |
} | |
int levenshtein(char *str1,char *str2){ | |
int str1len = strlen(str1); | |
int str2len = strlen(str2); | |
char buf1[str1len+1]; | |
char buf2[str2len+1]; | |
char buf3[str1len+1]; | |
char buf4[str2len+1]; | |
strcpy(buf1,str1); | |
strcpy(buf2,str2); | |
buf1[str1len-1]='\0'; | |
buf2[str2len-1]='\0'; | |
int i; | |
for(i=1;i<=str1len;i++){ | |
buf3[i-1]=str1[i]; | |
} | |
buf3[str1len] = '\0'; | |
for(i=1;i<=str2len;i++){ | |
buf4[i-1]=str2[i]; | |
} | |
buf4[str2len] = '\0'; | |
if(!strcmp(str1,str2)){ | |
return 0; | |
} | |
if(!strcmp(str1,"")){ | |
return str1len; | |
} | |
if(!strcmp(str2,"")){ | |
return str2len; | |
} | |
printf("%s %s %s %s %s %s\n",str1,str2,buf1,buf2,buf3,buf4); | |
return min(min(1+levenshtein(buf1,buf2), | |
min(1+levenshtein(buf1,str2), | |
1+levenshtein(str1,buf2))), | |
min(1+levenshtein(buf3,buf4), | |
min(1+levenshtein(buf3,str2), | |
1+levenshtein(str1,buf4))));} | |
int main(void){ | |
char *str1 = "Sunday"; | |
char *str2 = "nday"; | |
int n = levenshtein(str1,str2); | |
printf("%d\n",n); | |
return 0; | |
} |
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