随笔分类 - Level 3
摘要：Given an array arr of positive integers sorted in a strictly increasing order, and an integer k. Return the kth positive integer that is missing from
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摘要：You are given a string s and an integer k. You can choose any character of the string and change it to any other uppercase English character. You can
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摘要：his is an interactive problem. You are given an array of unique strings wordlist where wordlist[i] is 6 letters long, and one word in this list is cho
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摘要：A Range Module is a module that tracks ranges of numbers. Design a data structure to track the ranges represented as half-open intervals and query abo
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摘要：Given strings s1 and s2, return the minimum contiguous substring part of s1, so that s2 is a subsequence of the part. If there is no such window in s1
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摘要：Given a rows x cols screen and a sentence represented as a list of strings, return the number of times the given sentence can be fitted on the screen.
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摘要：We have n jobs, where every job is scheduled to be done from startTime[i] to endTime[i], obtaining a profit of profit[i]. You're given the startTime,
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摘要：Alex and Lee play a game with piles of stones. There are an even number of piles arranged in a row, and each pile has a positive integer number of sto
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摘要：You are given an n x n binary matrix grid. You are allowed to change at most one 0 to be 1. Return the size of the largest island in grid after applyi
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摘要：Given a matrix of integers A with R rows and C columns, find the maximum score of a path starting at [0,0] and ending at [R-1,C-1]. The score of a pat
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摘要：Given a string S, check if the letters can be rearranged so that two characters that are adjacent to each other are not the same. If possible, output
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摘要：Given a non-negative integer, you could swap two digits at most once to get the maximum valued number. Return the maximum valued number you could get.
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摘要：Given a robot cleaner in a room modeled as a grid. Each cell in the grid can be empty or blocked. The robot cleaner with 4 given APIs can move forward
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摘要：Given a node from a Circular Linked List which is sorted in ascending order, write a function to insert a value insertVal into the list such that it r
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摘要：Given an array of integers nums and an integer target. Return the number of non-empty subsequences of nums such that the sum of the minimum and maximu
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摘要：Given the root of a Binary Search Tree and a target number k, return true if there exist two elements in the BST such that their sum is equal to the g
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摘要：Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character. Example 1: Input: S =
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摘要：In an infinite chess board with coordinates from -infinity to +infinity, you have a knight at square [0, 0].A knight has 8 possible moves it can make,
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摘要：In an N by N square grid, each cell is either empty (0) or blocked (1). A clear path from top-left to bottom-right has length k if and only if it is c
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摘要：In a given array nums of positive integers, find three non-overlapping subarrays with maximum sum. Each subarray will be of size k, and we want to max
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