平方數數獨 Perfect Squares Sudoku

規則：在空格中填入1∼9，使得每一行、列、宮中的數字都沒有重複外；標示處的上下或左右相鄰的兩位數需是平方數(例 25為 5 的平方)，沒有標示處則不得為平方數。
rule : Apply classic sudoku rules. If two horizontally or vertically adjacent cells (read from left to right and from top to bottom) form a two-digit perfect square, it is marked by a gray square. All two-digit perfect squares are marked.
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