Leetcode 2661. First Completely Painted Row or Column

Given an order arr of unique values and a matrix mat that maps each value to a cell, find the smallest index i such that after painting arr[0..i] an entire row or column is fully painted. Core idea: map each value to its (row,column) and track counts per row/column until one reaches its full length.

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Leetcode 2661. First Completely Painted Row or Column

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