随笔分类 - Leetcode
摘要：Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list t
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摘要：In a given integer array nums, there is always exactly one largest element. Find whether the largest element in the array is at least twice as much as
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摘要：On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). Once you pay the cost, you can either climb one or two steps. Y
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摘要：Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements. Your t
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摘要：Given a 2D integer matrix M representing the gray scale of an image, you need to design a smoother to make the gray scale of each cell becomes the ave
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摘要：Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the
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摘要：In a string S of lowercase letters, these letters form consecutive groups of the same character. For example, a string like S = "abbxxxxzyy" has the g
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摘要：We have two special characters. The first character can be represented by one bit 0. The second character can be represented by two bits (10 or 11). N
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摘要：Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, n]
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摘要：Given a binary matrix A, we want to flip the image horizontally, then invert it, and return the resulting image. To flip an image horizontally means t
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摘要：Solution: 1. From left to right
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摘要：Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) Yo
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摘要：A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same element. Now given an M x N matrix, return True if and only if the m
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摘要：Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single element
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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 two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are n
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摘要：Given m arrays, and each array is sorted in ascending order. Now you can pick up two integers from two different arrays (each array picks one) and cal
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摘要：Given a list of positive integers, the adjacent integers will perform the float division. For example, [2,3,4] -> 2 / 3 / 4. However, you can add any
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摘要：Suppose you have a long flowerbed in which some of the plots are planted and some are not. However, flowers cannot be planted in adjacent plots - they
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摘要：You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be rep
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