随笔分类 - LeetCode
摘要：Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example: Example 1: Example 2: Example 3: A 1 AA 26+
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摘要：Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number.The function
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摘要：A peak element is an element that is greater than its neighbors.Given an input array nums, where nums[i] ≠ nums[i+1], find a peak element and return i
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摘要：Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists: begin to in
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摘要：Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2]). F
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摘要：Given an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product. Example 1: E
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摘要：Sort a linked list using insertion sort. Example 1: Example 2:
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摘要：Given a binary tree, return the preorder traversal of its nodes' values. Example: Follow up: Recursive solution is trivial, could you do it iterativel
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摘要：Given a linked list, return the node where the cycle begins. If there is no cycle, return null. To represent a cycle in the given linked list, we use
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摘要：Given a non-empty string s and a dictionary wordDict containing a list of non-empty words, determine if s can be segmented into a space-separated sequ
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摘要：There are N children standing in a line. Each child is assigned a rating value. You are giving candies to these children subjected to the following re
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摘要：Given a non-empty array of integers, every element appears three times except for one, which appears exactly once. Find that single one. Note: Your al
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摘要：There are N gas stations along a circular route, where the amount of gas at station i is gas[i].You have a car with an unlimited gas tank and it costs
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摘要：Given a non-empty array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runti
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摘要：Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path1->2->3 which
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摘要：Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Your algorithm should run in O(n) complexity. Examp
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摘要：Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from beginWord to endWord,
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摘要：Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note: For the purpose of this problem, w
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摘要：Say you have an array for which the ith element is the price of a given stock on day i.If you were only permitted to complete at most one transaction
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摘要：Given a binary tree, flatten it to a linked list in-place. For example, given the following tree: The flattened tree should look like:
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