Leetcode 3071. Minimum Operations to Write the Letter Y on a Grid
Given an odd n x n grid with values 0–2, find the minimum number of single-cell changes needed so that all cells on the letter Y (the two diagonals to the center plus the central vertical down to the bottom) share one value and all other cells share a different value. This reduces to counting value frequencies among Y and non‑Y cells and choosing two distinct target values that maximize preserved cells.
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