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Solution: Lucky Numbers in a Matrix

Explore how to identify a lucky number in a matrix by understanding it as the smallest element in its row and largest in its column. Learn to apply a greedy algorithm that scans matrix rows and columns to find this unique element, with efficient time and space use, deepening your grasp of matrix and graph problem-solving techniques.

Statement

Given an m×nm \times n matrix of distinct numbers, return the lucky number in the matrix.

lucky number is an element of the matrix such that it is the smallest element in its row and largest in its column.

Constraints:

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