随笔分类 - LeetCode
摘要：Given an array of non negative integers, the array is squareful if for every pair of adjacent elements, their sum is a perfect square. Return the numb
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摘要：You are given an `grid` where each cell can have one of three values: representing an empty cell, representing a fresh orange, or representing a rotte
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摘要：In a binary tree, the root node is at depth , and children of each depth node are at depth . Two nodes of a binary tree are cousins if they have the s
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摘要：Given an array of positive integers, call a (contiguous, not necessarily distinct) subarray of good if the number of different integers in that subarr
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摘要：On a broken calculator that has a number showing on its display, we can perform two operations: Double: Multiply the number on the display by 2, or; D
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摘要：Given two strings and , return the length of their longest common subsequence. A subsequence of a string is a new string generated from the original s
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摘要：Given an array equations of strings that represent relationships between variables, each string has length and takes one of two different forms: or .
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摘要：For a non negative integer , the array form of is an array of its digits in left to right order. For example, if , then the array form is . Given the
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摘要：Given the of a binary tree, each node has a value from to representing the letters to : a value of represents , a value of represents , and so on. Fin
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摘要：Given two lists of closed intervals, each list of intervals is pairwise disjoint and in sorted order. Return the intersection of these two interval li
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摘要：We have an array of integers, and an array of queries. For the th query , we add val to . Then, the answer to the th query is the sum of the even valu
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摘要：Given two integers and , return any string such that: has length and contains exactly `'a' b` letters, The substring does not occur in , and The subst
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摘要：In a country popular for train travel, you have planned some train travelling one year in advance. The days of the year that you will travel is given
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摘要：Given an array of integers , find the number of triples of indices (i, j, k) such that: `0 这道题给了一个数组，定义了一种三元组，使得这三个数字相‘与’得到为0，问有多少种不同的组合。根据题目中的例子可以发现，
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摘要：Create a timebased key value store class , that supports two operations. 1\. Stores the and , along with the given . 2\. Returns a value such that was
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摘要：On a 2 dimensional , there are 4 types of squares: represents the starting square. There is exactly one starting square. represents the ending square.
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摘要：You are given the root of a binary tree with n nodes where each node in the tree has node.val coins and there are n coins total. In one move, we may c
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摘要：Given an integer array , return the length of a maximum size turbulent subarray of . A subarray is turbulent if the comparison sign flips between each
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摘要：Given an array of positive lengths, return the largest perimeter of a triangle with non zero area, formed from 3 of these lengths. If it is impossible
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摘要：Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order. Example 1: I
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