#### Validate Sudoku Board

This function takes in a 2D array and determines if it is a valid Sudoku board. A Sudoku board is valid if each row, column, and 3x3 subarray contains exactly 9 integers.

#### Problem

```Given a 2D array of integers, write a function that determines whether the array is a valid Sudoku board. A Sudoku board is valid if:
- Each row contains exactly 9 integers
- Each column contains exactly 9 integers
- Each 3x3 subarray (indicated by bold lines in the array below) contains exactly 9 integers
Input:
[[5,3,4,6,7,8,9,1,2],
[6,7,2,1,9,5,3,4,8],
[1,9,8,3,4,2,5,6,7],
[8,5,9,7,6,1,4,2,3],
[4,2,6,8,5,3,7,9,1],
[7,1,3,9,2,4,8,5,6],
[9,6,1,5,3,7,2,8,4],
[2,8,7,4,1,9,6,3,5],
[3,4,5,2,8,6,1, 7,9]]
Output: true```

#### Solution

This solution is in Python. Our A.I. can create solutions in multiple languages.
by kayakane
```def is_valid_sudoku(board):
# check rows
for row in board:
if not is_valid_row(row):
return False
# check columns
for i in range(len(board)):
column = [row[i] for row in board]
if not is_valid_row(column):
return False
# check 3x3 subarrays
for i in range(0, len(board), 3):
for j in range(0, len(board), 3):
subarray = [board[i][j], board[i][j+1], board[i][j+2], board[i+1][j], board[i+1][j+1], board[i+1][j+2], board[i+2][j], board[i+2][j+1], board[i+2][j+2]]
if not is_valid_row(subarray):
return False
return True

def is_valid_row(row):
return len(row) == 9 and len(set(row)) == 9 and all(0 < x < 10 for x in row)

board = [[5,3,4,6,7,8,9,1,2],
[6,7,2,1,9,5,3,4,8],
[1,9,8,3,4,2,5,6,7],
[8,5,9,7,6,1,4,2,3],
[4,2,6,8,5,3,7,9,1],
[7,1,3,9,2,4,8,5,6],
[9,6,1,5,3,7,2,8,4],
[2,8,7,4,1,9,6,3,5],
[3,4,5,2,8,6,1, 7,9]]

print(is_valid_sudoku(board))```

A.I. Evaluation of the Solution

The candidate's solution correctly solves the problem. The solution is complete, with functions to check rows, columns, and 3x3 subarrays. The candidate's approach is clear and easy to follow.

Evaluated at: 2022-11-09 08:16:07