[LeetCode] 1328. Break a Palindrome
Given a palindromic string of lowercase English letters palindrome, replace exactly one character with any lowercase English letter so that the resulting string is not a palindrome and that it is the
[LeetCode] 2007. Find Original Array From Doubled Array
An integer array original is transformed into a doubled array changed by appending twice the value of every element in original, and then randomly shuffling the resulting array. Given an array changed
[LeetCode] 1608. Special Array With X Elements Greater Than or Equal X
You are given an array nums of non-negative integers. nums is considered special if there exists a number x such that there are exactly x numbers in nums that are greater than or equal to x. Notice th
[LeetCode] 1184. Distance Between Bus Stops
A bus has n stops numbered from 0 to n - 1 that form a circle. We know the distance between all pairs of neighboring stops where distance[i] is the distance between the stops number i and (i + 1) % n.
[LeetCode] 828. Count Unique Characters of All Substrings of a Given String
Let’s define a function countUniqueChars(s) that returns the number of unique characters in s. For example, calling countUniqueChars(s) if s = “LEETCODE” then “L”, “T”, “C”, “O”, “D” are the uniq
[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