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题目： Given an integer, write a function to determine if it is a power of three. Follow up:Could you do it without using any loop / recursion? 链接： https 阅读全文
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题目： Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Note: 链接： http://leetcode.com/probl 阅读全文
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题目： You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + and -, you and your friend tak 阅读全文
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题目： You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to remove 1 to 3 阅读全文
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题目： Given a pattern and a string str, find if str follows the same pattern. Here follow means a full match, such that there is a bijection between a l 阅读全文
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题目： Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements. For example, 阅读全文