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Diffstat (limited to 'compare_strings_freq_char.c')
-rw-r--r-- | compare_strings_freq_char.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/compare_strings_freq_char.c b/compare_strings_freq_char.c new file mode 100644 index 0000000..2005764 --- /dev/null +++ b/compare_strings_freq_char.c @@ -0,0 +1,59 @@ +// 1170. Compare Strings by Frequency of the Smallest Character +#include "leetcode.h" + +/* + * let the function 'f(s)' be the frequency of the lexicographically smallest + * character in a non empty string 's'. for example, if 's = dcce' then 'f(s) = + * 2' because the lexicographically smallest character is 'c', which has a + * frequency of 2. you are given an array of strings 'words' and another array + * of query strings 'queries'. for each query 'queries[i]', count the number of + * words in 'words' such that 'f(queries[i]) < f(w)' for each 'w' in 'words'. + * return an integer array 'answer' where each 'answer[i]' is the answer to the + * i'th query + */ + +int lex_freq(char *w) { + int *map = (int *)calloc('z' - 'a' + 1, sizeof(int)), res; + char smallest = 'z'; + for (int i = 0; w[i]; i++) { + map[w[i] - 'a']++; + smallest = fmin(smallest, w[i]); + } + res = map[smallest - 'a']; + free(map); + return res; +} + +int *numSmallerByFrequency(char **queries, int queriesSize, char **words, + int wordsSize, int *returnSize) { + int *word_freq = (int *)malloc(wordsSize * sizeof(int)); + int *ans = (int *)calloc(queriesSize, sizeof(int)), freq; + *returnSize = queriesSize; + for (int i = 0; i < wordsSize; i++) + word_freq[i] = lex_freq(words[i]); + for (int i = 0; i < queriesSize; i++) { + freq = lex_freq(queries[i]); + for (int j = 0; j < wordsSize; j++) + if (freq < word_freq[j]) + ans[i]++; + } + free(word_freq); + return ans; +} + +int main() { + char *q1[] = {"cbd"}, *q2[] = {"bbb", "cc"}; + char *w1[] = {"zaaaz"}, *w2[] = {"a", "aa", "aaa", "aaaa"}; + int rs1, rs2; + int *nsbf1 = numSmallerByFrequency((char **)q1, ARRAY_SIZE(q1), (char **)w1, + ARRAY_SIZE(w1), &rs1); + int *nsbf2 = numSmallerByFrequency((char **)q2, ARRAY_SIZE(q2), (char **)w2, + ARRAY_SIZE(w2), &rs2); + for (int i = 0; i < rs1; i++) + printf("%d ", nsbf1[i]); // expect: 1 + printf("\n"); + for (int i = 0; i < rs2; i++) + printf("%d ", nsbf2[i]); // expect: 1 2 + printf("\n"); + free(nsbf1), free(nsbf2); +} |