A compressed string consists of any number of pairs, where each pair consists of (number, pattern). A pattern can be a sub-string with any length, e.g., “ab”. The number designates the number of repetition of the pattern. This assignment is to decompress the compressed string. For example, we will decompress “3ab” into “ababab”.

一段壓縮過的字串由任意數量的配對所組成，其中每對由(數字, 樣版)所組成。樣版可以是具有任何長度的子字串，例如“ab”。數字表示樣版的重複次數。這樣的設定用於解壓縮字串。例如，我們將“3ab”解壓縮為“ababab”。