题目：

题解：

func isValidSudoku(board [][]byte) bool {var rows, columns [9][9]intvar subboxes [3][3][9]intfor i, row := range board {for j, c := range row {if c == '.' {continue}index := c - '1'rows[i][index]++columns[j][index]++subboxes[i/3][j/3][index]++if rows[i][index] > 1 || columns[j][index] > 1 || subboxes[i/3][j/3][index] > 1 {return false}}}return true
}