Robina Li

Given a string s which consists of lowercase or uppercase letters, return the length of the longest palindrome that can be built with those letters.

A trie (pronounced as “try”) or prefix tree is a tree data structure used to efficiently store and retrieve keys in a dataset of strings. There are various applications of...

A k-booking happens when k events have some non-empty intersection (i.e., there is some time that is common to all k events).

You are given a string s. The score of a string is defined as the sum of the absolute difference between the ASCII values of adjacent characters.

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.

You are given an integer array nums and you have to return a new array counts. The array counts has the property where counts[i] is the number of smaller elements...

You are given two integer arrays fruits and baskets.

Given an integer array nums, handle multiple queries of the following types:

You are given an empty 2D binary grid grid of size m x n. The grid represents a map where 0’s represent water and 1’s represent land. Initially, all the...

There is a directed graph of n nodes with each node labeled from 0 to n - 1. The graph is represented by a 0-indexed 2D integer array graph where...