随笔分类 - LeetCode
摘要：You have a 1-indexed binary string of length n where all the bits are 0 initially. We will flip all the bits of this binary string (i.e., change them
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摘要：Given an integer n, return a string with n characters such that each character in such string occurs an odd number of times. The returned string must
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摘要：Given a binary tree `root`, return *the maximum sum of all keys of any sub-tree which is also a Binary Search Tree (BST)*. Assume a BST is defined as
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摘要：You are given the root of a binary tree. A ZigZag path for a binary tree is defined as follow: Choose any node in the binary tree and a direction (rig
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摘要：Given the string s, return the size of the longest substring containing each vowel an even number of times. That is, 'a', 'e', 'i', 'o', and 'u' must
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摘要：You are given a string s. Reorder the string using the following algorithm: Remove the smallest character from s and append it to the result. Remove t
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摘要：Given an m x n grid. Each cell of the grid has a sign pointing to the next cell you should visit if you are currently in this cell. The sign of grid[i
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摘要：Given a binary tree root and a linked list with head as the first node. Return True if all the elements in the linked list starting from the head corr
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摘要：In a special ranking system, each voter gives a rank from highest to lowest to all teams participating in the competition. The ordering of teams is de
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摘要：Given an array of digits digits, return the largest multiple of three that can be formed by concatenating some of the given digits in any order. If th
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摘要：Given an integer num, find the closest two integers in absolute difference whose product equals num + 1 or num + 2. Return the two integers in any ord
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摘要：You have n binary tree nodes numbered from 0 to n - 1 where node i has two children leftChild[i] and rightChild[i], return true if and only if all the
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摘要：Write a program to count the number of days between two dates. The two dates are given as strings, their format is YYYY-MM-DD as shown in the examples
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摘要：Given n orders, each order consists of a pickup and a delivery service. Count all valid pickup/delivery possible sequences such that delivery(i) is al
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摘要：Given a string s consisting only of characters a, b and c. Return the number of substrings containing at least one occurrence of all these characters
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摘要：There is a supermarket that is frequented by many customers. The products sold at the supermarket are represented as two parallel integer arrays produ
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摘要：You are given an integer array arr. Sort the integers in the array in ascending order by the number of 1's in their binary representation and in case
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摘要：You are given an array target of n integers. From a starting array arr consisting of n 1's, you may perform the following procedure : let x be the sum
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摘要：You are given an array of events where events[i] = [startDayi, endDayi]. Every event i starts at startDayi and ends at endDayi. You can attend an even
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摘要：Design an algorithm that accepts a stream of integers and retrieves the product of the last k integers of the stream. Implement the ProductOfNumbers c
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