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15 challenges available

Number of Islands II

Given a 2D grid of empty land and island (0 and 1), dynamically add islands one by one and count total connected compone...

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Coders Crush by Napplied AI - Tech Interview & Coding Should Be Effortless

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Alien Dictionary

There is a new alien language which uses the latin alphabet. You are given a list of words written in this alien languag...

Minimum Cost Connect Points

You are given an array points representing integer coordinates of some points on a 2D-plane, where points[i] = [xi, yi]....

Swim in Rising Water

You are given an n x n integer matrix grid where you are located at the top-left corner (0, 0) and must reach the bottom...

Parallel Courses III

You are given an integer n which indicates that there are n courses labeled from 1 to n. You are also given an array rel...

Accounts Merge

Given a list of accounts where each element accounts[i] is a list of strings, where the first element accounts[i][0] is ...

Maximum Network Rank

There is an infrastructure of n cities with some number of roads connecting these cities. Each connected pair of cities ...

Graph Bipartition

There is an undirected graph with n nodes where each node is labeled from 1 to n. You are given a 2D array graph where g...

Reorder Routes for City Zero

There are n cities numbered from 0 to n - 1 and n - 1 roads such that there is only one way to travel between two differ...

Shortest Path Binary Matrix

Given an n x n binary matrix grid, return the length of the shortest clear path in the matrix. If there is no clear path...

Minimum Height Trees

A tree is an undirected graph in which any two nodes are connected by exactly one path. In other words, any connected gr...

Network Delay Time

You are given a network of n nodes labeled from 1 to n. You are also given times, a list of travel times as directed edg...

Path With Maximum Probability

You are given an undirected weighted graph of n nodes (0-indexed), represented by an edge list where edges[i] = [a, b] i...

All Paths Source to Target

Given a directed acyclic graph (DAG) of n nodes labeled from 0 to n - 1, find all paths from node 0 to node n - 1 and re...

Reconstruct Itinerary

You are given a list of airline tickets where tickets[i] = [fromi, toi] represent a ticket from airport fromi to airport...