[LeetCode] Remove Duplicate Letters 移除重復字母
Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure ...
原文：[leetcode] Remove Duplicate Letters
題目： 分析：通過觀察每個字母下標的規律，以 cbacdcbc 為例， 第一步，計算下標 countIndex ： 第二步，尋找符合條件的字母 findLetter ： 如果一個字母的第一個下標小於其后每個字母的最后一個下標，則該字母符合條件。比如 a 中的 小於 b 的 ，c 的 ，d 的 ，則 a 中的 符合條件。 第三步，刪除前面的下標 removeIndex ： 不防設第二步中符合條件的字 ...
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