随笔分类 - LeetCode
摘要：Given the root of a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one
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摘要：Print a binary tree in an m*n 2D string array following these rules: Example 1: Example 2: Example 3: Note: The height of binary tree is in the range
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摘要：Imagine you have a special keyboard with the following keys: Key 1: (A): Print one 'A' on screen. Key 2: (Ctrl-A): Select the whole screen. Key 3: (Ct
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摘要：Initially on a notepad only one character 'A' is present. You can perform two operations on this notepad for each step: Copy All: You can copy all the
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摘要：In the world of Dota2, there are two parties: the Radiant and the Dire. The Dota2 senate consists of senators coming from two parties. Now the senate
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摘要：In English, we have a concept called root, which can be followed by some other words to form another longer word - let's call this word successor. For
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摘要：Given a string, your task is to count how many palindromic substrings in this string. The substrings with different start indexes or end indexes are c
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摘要：You are given n pairs of numbers. In every pair, the first number is always smaller than the second number. Now, we define a pair (c, d) can follow an
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摘要：Solve a given equation and return the value of x in the form of string "x=#value". The equation contains only '+', '-' operation, the variable x and i
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摘要：The set S originally contains numbers from 1 to n. But unfortunately, due to the data error, one of the numbers in the set got duplicated to another n
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摘要：Given an array consisting of n integers, find the contiguous subarray of given length k that has the maximum average value. And you need to output the
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摘要：A message containing letters from A-Z is being encoded to numbers using the following mapping way: Beyond that, now the encoded string can also contai
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摘要：In LeetCode Store, there are n items to sell. Each item has a price. However, there are some special offers, and a special offer consists of one or mo
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摘要：Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array. Example 1: Input: 3 / \ 9 20 / \ 15 7 Outp
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摘要：Given the running logs of n functions that are executed in a nonpreemptive single threaded CPU, find the exclusive time of these functions. Each funct
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摘要：You are given several logs that each log contains a unique id and timestamp. Timestamp is a string that has the following format: Year:Month:Day:Hour:
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摘要：In combinatorial mathematics, a derangement is a permutation of the elements of a set, such that no element appears in its original position. There's
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摘要：You have k lists of sorted integers in ascending order. Find the smallest range that includes at least one number from each of the k lists. We define
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摘要：Given a non-negative integer c, your task is to decide whether there're two integers a and b such that a2 + b2 = c. Example 1: Example 2: 这道题让我们求一个数是否
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摘要：Your task is to design the basic function of Excel and implement the function of sum formula. Specifically, you need to implement the following functi
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