随笔分类 - LeetCode
摘要：Given a callable function f(x, y) with a hidden formula and a value z, reverse engineer the formula and return *all positive integer pairs x and y whe
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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：You are given a string containing only 4 kinds of characters 'Q', 'W', 'E' and 'R'. A string is said to be balancedif each of its characters appears n
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摘要：Given a list of folders folder, return the folders after removing all sub-folders in those folders. You may return the answer in any order. If a folde
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摘要：You are given an array coordinates, coordinates[i] = [x, y], where [x, y] represents the coordinate of a point. Check if these points make a straight
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摘要：n passengers board an airplane with exactly n seats. The first passenger has lost the ticket and picks a seat randomly. But after that, the rest of pa
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摘要：Given an array nums of positive integers, return the longest possible length of an array prefix of nums, such that it is possible to remove exactly on
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摘要：A die simulator generates a random number from 1 to 6 for each roll. You introduced a constraint to the generator such that it cannot roll the number
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摘要：On an 8x8 chessboard, there can be multiple Black Queens and one White King. Given an array of integer coordinates queens that represents the position
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摘要：Balanced strings are those that have an equal quantity of 'L' and 'R' characters. Given a balanced string s, split it in the maximum amount of balance
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摘要：Given an integer n, your task is to count how many strings of length n can be formed under the following rules: Each character is a lower case vowel (
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摘要：In a gold mine grid of size m x n, each cell in this mine has an integer representing the amount of gold in that cell, 0 if it is empty. Return the ma
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摘要：Given an integer array arr and an integer difference, return the length of the longest subsequence in arr which is an arithmetic sequence such that th
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摘要：We have n chips, where the position of the ith chip is position[i]. We need to move all the chips to the same position. In one step, we can change the
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摘要：In an n*n grid, there is a snake that spans 2 cells and starts moving from the top left corner at (0, 0) and (0, 1). The grid has empty cells represen
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摘要：You are given a string s and an integer k, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them, causing t
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摘要：You are given two strings s and t of the same length. You want to change s to t. Changing the i-th character of s to i-th character of t costs |s[i] -
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摘要：Given an array of integers arr, write a function that returns true if and only if the number of occurrences of each value in the array is unique. Exam
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摘要：Design a Skiplist without using any built-in libraries. A skiplist is a data structure that takes O(log(n)) time to add, erase and search. Comparing w
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摘要：There are n items each belonging to zero or one of m groups where group[i] is the group that the i-th item belongs to and it's equal to -1 if the i-th
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