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#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
bool check(char *word, char *lookup, char *q) {
memset(lookup, -1, 26);
for (int i = 0; word[i] != '\0'; ++i) {
if (lookup[word[i] - 'a'] == -1)
lookup[word[i] - 'a'] = i;
if (q[i] != lookup[word[i] - 'a'])
return false;
}
return true;
}
// note the returned array must be malloc'd (assume caller free()'s)
char **findAndReplacePattern(char **words, int wordsSize, char *pattern,
int *returnSize) {
char lookup[26];
memset(lookup, -1, 26);
char q[50] = {0};
char **ans = malloc(sizeof(char **) * wordsSize);
size_t len = strlen(pattern);
for (int i = 0; i < len; ++i) {
if (lookup[pattern[i] - 'a'] == -1)
lookup[pattern[i] - 'a'] = i;
q[i] = lookup[pattern[i] - 'a'];
}
int sz = 0;
for (int i = 0; i < wordsSize; ++i) {
if (check(words[i], lookup, q)) {
char *k = malloc(sizeof(char) * (len + 1));
memcpy(k, words[i], len + 1);
ans[sz++] = k;
}
}
*returnSize = sz;
return ans;
}
int main() {
char *words1[] = {"abc", "deq", "mee", "aqq", "dkd", "ccc"},
*words2[] = {"a", "b", "c"};
char pattern1[] = {"abb"}, pattern2[] = {"a"};
}
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