Leetcode 349: Intersection of Two Arrays
Question
Given two arrays, write a function to compute their intersection.
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Leetcode 346: Moving Average from Data Stream
Question Given a stream of integers and a window size, calculate the moving average of all integers in the sliding window. [Read More] -
Leetcode 339: Nested List Weight Sum
Question Given a nested list of integers, return the sum of all integers in the list weighted by their depth. [Read More] -
Segment Tree
A segment tree is a binary tree where each node represents an interval. Generally a node would store one or more properties of an interval which can be queried later. [Read More] -
Leetcode 307: Range Sum Query - Mutable
Question Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. [Read More] -
Leetcode 306: Additive Number
Question Additive number is a string whose digits can form additive sequence. [Read More] -
Leetcode 311: Sparse Matrix Multiplication
Question Given two sparse matrices A and B, return the result of AB. [Read More] -
Leetcode 305: Number of Islands II
Question A 2d grid map of m rows and n columns is initially filled with water. We may perform an addLand operation which turns the water at position (row, col) into a land. Given a list of positions to operate, count the number of islands after each addLand operation. An... [Read More] -
Leetcode 304: Range Sum Query 2D - Immutable
Question Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). [Read More] -
Leetcode 290: Word Pattern
Question Given a pattern and a string str, find if str follows the same pattern. [Read More] -
Leetcode 303: Range Sum Query - Immutable
Question Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. [Read More] -
Leetcode 300: Longest Increasing Subsequence
Question Given an unsorted array of integers, find the length of longest increasing subsequence. [Read More] -
Leetcode 299: Bulls and Cows
Question You are playing the following Bulls and Cows game with your friend: You write down a number and ask your friend to guess what the number is. Each time your friend makes a guess, you provide a hint that indicates how many digits in said guess match your secret... [Read More] -
Leetcode 298: Binary Tree Longest Consecutive Sequence
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Leetcode 296: Best Meeting Point
Question A group of two or more people wants to meet and minimize the total travel distance. You are given a 2D grid of values 0 or 1, where each 1 marks the home of someone in the group. The distance is calculated using Manhattan Distance, where distance (p1, p2)... [Read More]