First Completely Painted Row or Column at Citadel

Problem Description

You are given a **0-indexed** integer array `arr`, and an `m x n` integer **matrix** `mat`. `arr` and `mat` both contain **all** the integers in the range `[1, m * n]`. Go through each index `i` in `arr` starting from index `0` and paint the cell in `mat` containing the integer `arr[i]`. Return _t...

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