随笔分类 - Level 2
摘要：Given an array with distinct numbers, return an integer indicating the minimum number of swap operations required to sort the array into ascending ord
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摘要：A conveyor belt has packages that must be shipped from one port to another within D days. The i-th package on the conveyor belt has a weight of weight
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摘要：Given a 2D grid, each cell is either a wall 'W', an enemy 'E' or empty '0' (the number zero), return the maximum enemies you can kill using one bomb.T
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摘要：Given a list of daily temperatures T, return a list such that, for each day in the input, tells you how many days you would have to wait until a warme
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摘要：You want to build a house on an empty land which reaches all buildings in the shortest amount of distance. You can only move up, down, left and right.
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摘要：Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two
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摘要：Two strings X and Y are similar if we can swap two letters (in different positions) of X, so that it equals Y. For example, "tars" and "rats" are simi
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摘要：Design a hit counter which counts the number of hits received in the past 5 minutes. Each function accepts a timestamp parameter (in seconds granularity) and you may assume that calls are being made ...
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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：Given a collection of intervals, find the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping. Note: You
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摘要：Example : Infix : (A+B) * (C-D) ) Postfix: AB+CD-* 算法： 1. Scan the infix expression from left to right. 2. If the scanned character is an operand, app
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摘要：Given a list of strings, output the most frequent characters that are in the same group as the letter. For example, for string "abc", a, b,c are in th
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摘要：Your are given an array of positive integers nums. Count and print the number of (contiguous) subarrays where the product of all the elements in the s
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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 a positive integer N, how many ways can we write it as a sum of consecutive positive integers? Example 1: Example 2: Example 3: 分析：https://leetc
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摘要：Design a HashMap without using any built-in hash table libraries. To be specific, your design should include these functions: put(key, value) : Insert
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摘要：Given an array w of positive integers, where w[i] describes the weight of index i, write a function pickIndex which randomly picks an index in proport
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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：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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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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