diff options
Diffstat (limited to 'reorder_data_log_files.c')
-rw-r--r-- | reorder_data_log_files.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/reorder_data_log_files.c b/reorder_data_log_files.c new file mode 100644 index 0000000..18c4b88 --- /dev/null +++ b/reorder_data_log_files.c @@ -0,0 +1,45 @@ +// 937. Reorder Data in Log Files +#include "leetcode.h" + +/* + * given an array of 'logs'. each log is a space delimited sting of words where + * the first word is the identifier. there are two types of logs. letter logs + * where all words consist of lowercase english letters, and digit logs where + * all words consist of digits. reorder thesse logs so that the letter logs come + * before the digit logs, the letter logs are sorted lexicographically by their + * contents. if their contents are the same, then sort them lexicographically by + * their identifiers, the digit logs maintain their relative order. return the + * final order of the logs. + */ + +int cmp(const void *x, const void *y) { + const char *s1 = *(const char **)x, *s2 = *(const char **)y; + const char *sp1 = strchr(s1, ' '), *sp2 = strchr(s2, ' '); + bool a1 = isalpha(*++sp1), a2 = isalpha(*++sp2); + int r = 0, l = sp1 - s1; + return a1 && a2 ? !(r = strcmp(sp1, sp2)) ? strncmp(s1, s2, l) : r : a2 - a1; +} + +char **reorderLogFiles(char **logs, int logsSize, int *returnSize) { + qsort(logs, logsSize, sizeof(char *), cmp); + return *returnSize = logsSize, logs; +} + +int main() { + char *l1[] = {"dig1 8 1 5 1", "let1 art can", "dig2 3 6", "let2 own kit dig", + "let3 art zero"}; + char *l2[] = {"a1 9 2 3 1", "g1 act car", "zo4 4 7", "ab1 off key dog", + "a8 act zoo"}; + int rs1, rs2; + char **rlf1 = reorderLogFiles((char **)l1, ARRAY_SIZE(l1), &rs1); + char **rlf2 = reorderLogFiles((char **)l2, ARRAY_SIZE(l2), &rs2); + for (int i = 0; i < rs1; i++) + printf("%s ", rlf1[i]); // expect: "let1 art can","let3 art zero","let2 own + // kit dig","dig1 8 1 5 1","dig2 3 6" + printf("\n"); + for (int i = 0; i < rs2; i++) + printf("%s ", rlf2[i]); // expect: "g1 act car","a8 act zoo","ab1 off key + // dog","a1 9 2 3 1","zo4 4 7" + printf("\n"); + free(rlf1), free(rlf2); +} |