[LeetCode] 729. My Calendar I
You are implementing a program to use as your calendar. We can add a new event if adding the event will not cause a double booking. A double booking happens when two events have some non-empty interse
[LeetCode] 2116. Check if a Parentheses String Can Be Valid
A parentheses string is a non-empty string consisting only of ‘(‘ and ‘)’. It is valid if any of the following conditions is true:It is ().It can be written as AB (A concatenated with B), where A and
[LeetCode] 475. Heaters
Winter is coming! During the contest, your first job is to design a standard heater with a fixed warm radius to warm all the houses. Every house can be warmed, as long as the house is within the heate
[LeetCode] 2016. Maximum Difference Between Increasing Elements
Given a 0-indexed integer array nums of size n, find the maximum difference between nums[i] and nums[j] (i.e., nums[j] - nums[i]), such that 0 <= i < j < n and nums[i] < nums[j]. Retu
[LeetCode] 1491. Average Salary Excluding the Minimum and Maximum Salary
You are given an array of unique integers salary where salary[i] is the salary of the ith employee. Return the average salary of employees excluding the minimum and maximum salary. Answers within 10-5
[LeetCode] 2000. Reverse Prefix of Word
Given a 0-indexed string word and a character ch, reverse the segment of word that starts at index 0 and ends at the index of the first occurrence of ch (inclusive). If the character ch does not exist
[LeetCode] 1072. Flip Columns For Maximum Number of Equal Rows
You are given an m x n binary matrix matrix. You can choose any number of columns in the matrix and flip every cell in that column (i.e., Change the value of the cell from 0 to 1 or vice versa). Retur
[LeetCode] 1436. Destination City
You are given the array paths, where paths[i] = [cityAi, cityBi] means there exists a direct path going from cityAi to cityBi. Return the destination city, that is, the city without any path outg