LeetCode 830. Positions of Large Groups
Description https://leetcode.com/problems/positions-of-large-groups/ In a string s of lowercase letters, these letters form consecutive groups of the same character. For example, a string…
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LeetCode 219. Contains Duplicate II
Description https://leetcode.com/problems/contains-duplicate-ii/ Given an integer array nums and an integer k, return true if there are two distinct indices i and j in the array such that nums[i] == nums[j] and abs(i -…
LeetCode 203. Remove Linked List Elements
Description https://leetcode.com/problems/remove-linked-list-elements/ Given the head of a linked list and an integer val, remove all the nodes of the linked list that has Node.val…
LeetCode 414. Third Maximum Number
Description https://leetcode.com/problems/third-maximum-number/ Given integer array nums, return the third maximum number in this array. If the third maximum does not exist, return…
LeetCode 170. Two Sum III – Data structure design
Description https://leetcode.com/problems/two-sum-iii-data-structure-design/ Design a data structure that accepts a stream of integers and checks if it has a pair of…
LeetCode 434. Number of Segments in a String
Description https://leetcode.com/problems/number-of-segments-in-a-string/ You are given a string s, return the number of segments in the string. A segment is defined to be a contiguous…
LeetCode 1816. Truncate Sentence
Description https://leetcode.com/problems/truncate-sentence/ A sentence is a list of words that are separated by a single space with no leading or trailing spaces.…
LeetCode 1588. Sum of All Odd Length Subarrays
Description https://leetcode.com/problems/sum-of-all-odd-length-subarrays/ Given an array of positive integers arr, calculate the sum of all possible odd-length subarrays. A subarray is a…
LeetCode 1469. Find All The Lonely Nodes
Description https://leetcode.com/problems/find-all-the-lonely-nodes/ In a binary tree, a lonely node is a node that is the only child of its parent node. The…
LeetCode 1720. Decode XORed Array
Description https://leetcode.com/problems/decode-xored-array/ There is a hidden integer array arr that consists of n non-negative integers. It was encoded into another integer array encoded of length n – 1, such…