Leetcode 443. String Compression

  • If the group’s length is 1, append the character to s.
  • Otherwise, append the character followed by the group’s length.
Input: chars = ["a","a","b","b","c","c","c"]
Output: Return 6, and the first 6 characters of the input array should be: ["a","2","b","2","c","3"]
Explanation: The groups are "aa", "bb", and "ccc". This compresses to "a2b2c3".
Input: chars = ["a"]
Output: Return 1, and the first character of the input array should be: ["a"]
Explanation: The only group is "a", which remains uncompressed since it's a single character.

My algorithm

used vectors insert and erase to insert a new string and remove a repetition. not really efficient.

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