https://blog.lotp.xyz/tags/bit-operation/ Recent content in Bit Operation on Lotp's Blog Hugo en Tue, 13 Dec 2016 14:22:33 +0000 https://blog.lotp.xyz/posts/leetcode-417-ac-pacific-atlantic-water-flow/ Tue, 13 Dec 2016 14:22:33 +0000 https://blog.lotp.xyz/posts/leetcode-417-ac-pacific-atlantic-water-flow/ <p>Given an m x n matrix of non-negative integers representing the height of each unit cell in a continent, the &ldquo;Pacific ocean&rdquo; touches the left and top edges of the matrix and the &ldquo;Atlantic ocean&rdquo; touches the right and bottom edges.</p> <p>Water can only flow in four directions (up, down, left, or right) from a cell to another one with height equal or lower.</p> <p>Find the list of grid coordinates where water can flow to both the Pacific and Atlantic ocean.</p>