Sudoku Solver Problem

Problem Solve a well-posed sudoku puzzle. What Sudoku is a popular game that many of you are familiar with. The main idea of the game is to fill a grid with only the numbers from 1 to 9, while ensuring that each row and each column as well as each sub-grid of 9 elements does not contain duplicate numbers. Examples Example 1: ...

Second largest element in binary search tree

Problem Given a BST (Binary search tree), find the second largest element of it. Examples Example 1: 1 / \ 0 2 ...

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