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The n queens puzzle asks to place n queens on an n×n chessboard so that no two queens are attacking each other. Given a two-dimensional integer matrix where 1 …
You are given a two dimensional array matrix, containing strings “r”, “g”, and “b”. Perform a floodfill operation at row r, column c with the color target. A floodfill …
Given a singly linked list node, reorder it such that we take: the last node, and then the first node, and then the second last node, and then the …
Given a Unix path, represented as a list of strings, return its resolved version. In Unix, “..” means to go to the previous directory and “.” means to stay …
Given the root to a binary tree root, return a list of two numbers where the first number is the number of leaves in the tree and the second …