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LeetCode link: https://leetcode.com/problems/copy-list-with-random-pointer/ Question Description: A linked list is given such that each node contains an additional random pointer which could point to...

Given a 2d grid map of '1’s (land) and '0’s (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assum...