45 min whiteboard, 3 parts: 1. decimal -> 16 bit binary 2. arrange bits as 4x4 matrix 3. path of 0s from top-left to bottom-right? BFS or DFS (LC 200 / LC 1091 flavor) p1/p2 are warmups. p3 is the meat. edge case: start or end is 1 -> immediate No path

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Jump 4x4 binary path phone screen

45 min whiteboard, 3 parts: 1.