#1961Medium#53 in Zoho's list· asked at 10 companies
Valid Sudoku
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What we know
Example 1
Input: board = [["5","3",".",".","7",".",".",".","."],["6",".",".","1","9","5",".",".","."],[".","9","8",".",".",".",".","6","."],["8",".",".",".","6",".",".",".","3"],["4",".",".","8",".","3",".",".","1"],["7",".",".",".","2",".",".",".","6"],[".","6",".",".",".",".","2","8","."],[".",".",".","4","1","9",".",".","5"],[".",".",".",".","8",".",".","7","9"]] Output: true
Example 2
Input: Same board but with board[0][0] changed from "5" to "8" Output: false
Two 8s now appear in the top-left 3 x 3 box.
Constraints
- •
board.length == 9 - •
board[i].length == 9 - •
board[i][j]is a digit 1-9 or '.'.