随笔分类 - LeetCode
摘要：题目： Given a non-empty array of integers, return the k most frequent elements. For example,Given [1,1,1,2,2,3] and k = 2, return [1,2]. Note: You may a
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摘要：题目： 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 path 1->2->3
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摘要：题目： Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root).
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摘要：题目： Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: But the
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摘要：题目： Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the
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摘要：题目： Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. For example,Given
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摘要：题目： Given a list, rotate the list to the right by k places, where k is non-negative. For example:Given 1->2->3->4->5->NULL and k = 2,return 4->5->1->2
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摘要：题目： Given a list, rotate the list to the right by k places, where k is non-negative. For example:Given 1->2->3->4->5->NULL and k = 2,return 4->5->1->2
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摘要：题目： Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integ
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摘要：题目： Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your m
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摘要：题目： Reverse a linked list from position m to n. Do it in-place and in one-pass. For example:Given 1->2->3->4->5->NULL, m = 2 and n = 4, return 1->4->3
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摘要：题目： Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. According to the definition of LCA on Wikip
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摘要：题目： 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 a
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摘要：题目： Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in
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摘要：题目： You are playing the following Bulls and Cows game with your friend: You write down a number and ask your friend to guess what the number is. Each
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摘要：题目： Given a singly linked list, determine if it is a palindrome. 判断一个单链表是不是回文 思路： 1、遍历整个链表，将链表每个节点的值记录在数组中，再判断数组是不是一个回文数组，时间复杂度为O（n），但空间复杂度也为O（n），不满足空
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摘要：题目： Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to the product of all the elements of nums exc
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摘要：题目： Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \ 2 3 \ 5 All root-to-leaf paths are: ["1->2
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摘要：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
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摘要：题目： Given a linked list, remove the nth node from the end of list and return its head. For example, Given linked list: 1->2->3->4->5, and n = 2. After
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