[LeetCode] Remove Duplicate Letters 移除重复字母
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
题目： 分析：通过观察每个字母下标的规律，以 cbacdcbc 为例， 第一步，计算下标 countIndex ： 第二步，寻找符合条件的字母 findLetter ： 如果一个字母的第一个下标小于其后每个字母的最后一个下标，则该字母符合条件。比如 a 中的 小于 b 的 ，c 的 ，d 的 ，则 a 中的 符合条件。 第三步，删除前面的下标 removeIndex ： 不防设第二步中符合条件的字 ...
2015-12-10 20:43 0 1807 推荐指数：
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