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 ...
2015-12-29 13:09 1 15084 推荐指数：
Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure ...
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 ...
We have a string S of lowercase letters, and an integer array shifts. Call the shift of a letter, the next letter in the alphabet, (wrapping ...
Given several boxes with different colors represented by different positive numbers. You may experience several rounds to remove boxes until ...
Given a C++ program, remove comments from it. The program source is an array where source[i] is the i-th line of the source code. This represents ...
Start from integer 1, remove any integer that contains 9 such as 9, 19, 29... So now, you will have a new integer sequence ...
Given a sorted linked list, delete all duplicates such that each element appear only once. Example 1: Example 2: 这道题让我们移除给定有序链表的重复项 ...
Write a SQL query to find all duplicate emails in a table named Person. For example, your query should return the following for the above table ...
