import Foundation
// Sudoku solution must satisfy all of the following rules:
// Each of the digits 1-9 must occur once in each row.
// Each of the digits 1-9 must occur once in each column.
// Each of the digits 1-9 must occur once in each 3x3 grid.
func isValidSudoku3x3Grid(_ grid: [[Int]]) -> Bool {
guard grid.count == 3, grid[0].count == 3 else {
return false // Ensure it's a 3x3 grid
}
var seen = Set<Int>()
for row in grid {
for num in row {
if num < 1 || num > 9 || seen.contains(num) {
return false // Invalid if the number is out of range or repeated
}
seen.insert(num)
}
}
return true // Valid if all numbers 1-9 appear exactly once
}
let grid: [[Int]] = [
[5, 3, 4],
[6, 7, 2],
[1, 9, 8]
]
if isValidSudoku3x3Grid(grid) {
print("The grid is a valid Sudoku grid!")
} else {
print("The grid is NOT a valid Sudoku grid!")
}
/*
run:
The grid is a valid Sudoku grid!
*/
