# 踩地雷程式 Swift Code

### 給定列數(row)和行數(col)以及全部的地雷個數，寫出踩地雷遊戲

``````// -1 represents mine
//  N represents mine around the grid, N ∈ [0, 8]
func createGame(row: Int, col: Int, mine_num: Int) -> [[Int]]{
var map: [[Int]] = Array(repeating: Array(repeating: 0, count: col), count: row)
for _ in 0 ..< mine_num {
let (i, j) = generateMine(map, row, col)
map[i][j] = -1
}
for i in 0 ..< row {
for j in 0 ..< col {
if map[i][j] != -1 {
map[i][j] = checkMineNum(map, row, col, i, j)
}
}
}
return map
}

func generateRandomNum(max: Int) -> Int {
return Int.random(in: 0 ..< max)
}

func generateMine(_ map: [[Int]], _ row: Int, _ col: Int) -> (Int, Int) {
var rowIndex = -1
var colIndex = -1
repeat {
rowIndex = generateRandomNum(max: row)
colIndex = generateRandomNum(max: col)
} while map[rowIndex][colIndex] == -1
return (rowIndex, colIndex)
}

func checkMineNum(_ map: [[Int]], _ row: Int, _ col: Int, _ x: Int, _ y: Int) -> Int {
func isXWithin(_ x: Int) -> Bool {
return x >= 0 && x < row
}
func isYWithin(_ y: Int) -> Bool {
return y >= 0 && y < col
}
var result = 0
for i in (x - 1) ..< (x + 1) {
for j in (y - 1) ..< (y + 1) {
if isXWithin(i) && isYWithin(j) {
if map[i][j] == -1 {
result += 1
}
}
}
}
return result
}

func printMineGame(_ map: [[Int]]) {
for i in 0 ..< map.count {
var result = ""
for j in 0 ..< map[i].count {
let str = String(format:"%2d",map[i][j])
result += "\(str),"
}
print(result)
}
}

let game = createGame(row: 5, col: 5, mine_num: 5)
printMineGame(game)
``````

## Sample Output:

`````` 0, 0, 0, 0, 0,
0, 0,-1,-1,-1,
-1, 1, 1,-1, 3,
1, 1, 0, 1, 1,
0, 0, 0, 0, 0,``````