[LeetCode] 316. 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 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 your result is the smallest in lexicographical order ...
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[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 ...
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