06 2016 档案
摘要：You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you cl
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摘要：Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored such that the most significant digit is a
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摘要：A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any p
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摘要：Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [−2,1,−3,4,−1,2,
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摘要：Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of
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摘要：Determine whether an integer is a palindrome. Do this without extra space. 判断一个整数是否是回文数。 思路：求出数字abcd的逆序的数值dcba，如果是回文数的话，那么abcd==dcba。 时间复杂度:O(n) pytho
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摘要：Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have ex
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