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Diffstat (limited to 'string_compression3.c')
-rw-r--r-- | string_compression3.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/string_compression3.c b/string_compression3.c new file mode 100644 index 0000000..8836ce3 --- /dev/null +++ b/string_compression3.c @@ -0,0 +1,36 @@ +// 3163. String Compression III +#include "leetcode.h" + +/* + * given a string 'word', compress it using the following algorithm: begin with + * an empty string 'comp'. while 'word' is not empty, use the following + * operation: remove a maximum length prefix of 'word' made of a single + * character 'c' repeating at most 9 times. append the length of the prefix + * followed by 'c' to 'comp'. return the string 'comp' + */ + +char *compressedString(char *word) { + int n = strlen(word), cnt = 1, idx = 0; + char *comp = (char *)calloc(2 * n + 1, sizeof(char)); + for (int i = 0; i < n; i++) { + if (i == n || word[i] != word[i + 1] || cnt == 9) { + comp[idx] = cnt + '0'; + idx++; + comp[idx] = word[i]; + idx++; + cnt = 1; + } else + cnt++; + } + comp[idx] = '\0'; + return comp; +} + +int main() { + char *w1 = "abcde", *w2 = "aaaaaaaaaaaaaabb"; + char *cs1 = compressedString(w1); + char *cs2 = compressedString(w2); + printf("%s\n", cs1); // expect: 1a1b1c1d1e + printf("%s\n", cs2); // expect: 9a5a2b + free(cs1), free(cs2); +} |