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Given a linked list, remove the nth node from the end of the list and return its head. For example, Given linked list: 1->2->3->4->5, an…
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Maximum Units on a Truck - Array - Easy - LeetCode
You are assigned to put some amount of boxes onto one truck. You are given a 2D array boxTypes, where boxTypes[i] = [numberOfBoxesi, numberOfUnitsPerBoxi]: numberOfBoxesi is the number of boxes of typ…
Determine if String Halves Are Alike - String - Easy - LeetCode
You are given a string s of even length. Split this string into two halves of equal lengths, and let a be the first half…
Number of Students Unable to Eat Lunch - String - Easy - LeetCode
The school cafeteria offers circular and square sandwiches at lunch break, referred to by numbers 0 and 1 respectively. …
Reformat Phone Number - String - Easy - LeetCode
You are given a phone number as a string number. number consists of digits, spaces ' ', and/or dashes '-'. You would lik…
Count of Matches in Tournament - String - Easy - LeetCode
You are given an integer n, the number of teams in a tournament that has strange rules: If the current number of teams i…
Count the Number of Consistent Strings - String - Easy - LeetCode
You are given a string allowed consisting of distinct characters and an array of strings words. A string is consistent i…
Goal Parser Interpretation - String - Easy - LeetCode
You own a Goal Parser that can interpret a string command. The command consists of an alphabet of "G", "()" and/or "(al)…
Richest Customer Wealth - String - Easy - LeetCode
You are given an m x n integer grid accounts where accounts[i][j] is the amount of money the ith customer…
Maximum Repeating Substring - String - Easy - LeetCode
For a string sequence, a string word is k-repeating if word concatenated k times is a substring of sequence. The word's …
Check If Two String Arrays are Equivalent - String - Easy - LeetCode
Given two string arrays word1 and word2, return true if the two arrays represent the same string, and false otherwise. A…
Valid Triangle Number - Array - Medium - LeetCode
Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array tha…
Shortest Unsorted Continuous Subarray - Array - Medium - LeetCode
Given an integer array nums, you need to find one continuous subarray that if you only sort this subarray in ascending o…
Array Nesting - Array - Medium - LeetCode
A zero-indexed array A of length N contains all integers from 0 to N-1. Find and return the longest length of set S, whe…
Subarray Sum Equals K - Array - Medium - LeetCode
Given an array of integers nums and an integer k, return the total number of continuous subarrays whose sum equals to k.…
K-diff Pairs in an Array - Array - Medium - LeetCode
Given an array of integers nums and an integer k, return the number of unique k-diff pairs in the array. A k-diff pair i…