A Leetcode hard problem on graph

Longest Cycle in a Graph

Leetcode: Longest Nice Subarray

A bitmask problem

You are given an array nums consisting of positive integers.

We call a subarray of nums nice if the bitwise AND of every pair of elements that are in different positions in the subarray is…

Leetcode: Find Closest Node to Given Two Nodes

A graph problem

You are given a directed graph of n nodes numbered from 0 to n - 1, where each node has at most one outgoing edge.

Leetcode: Fair Distribution of Cookies

Easier to think in terms of Binary Search

You are given an integer array cookies, where cookies[i] denotes the number of cookies in the ith bag. You are also given an integer k that denotes the number of…

Leetcode: Paths in Matrix Whose Sum Is Divisible by K

A Dynamic Programming (DP) problem

Leetcode Contest 301: Move Pieces to Obtain a String

Linear Solution in Python

You are given two strings start and target, both of length n. Each string consists only of the characters 'L', 'R', and '_' where: