Challenge accepted!

Challenges/0002-Minesweeeper/Minesweeper.playground/Contents.swift

@@ -28,17 +28,96 @@ Safe squares are denoted by "." and mine squares by "*", both without the quotes
 A matrix replacing all the "." characters by the number of mines adjacent to that square.
 */
 
+enum MineSweeperSolverException: ErrorType {
+  case NoMineThere
+  case IncorrectMineBounds
+}
 
-func challenge_0002(n: Int, _ m: Int, _ field:[[String]]) -> [[String]] {
+struct MineSweeperSolver {
+
+  let mine: [String]
+  let rows: Int
+  let columns: Int
+
+  init?(rows: Int, columns: Int, mine: [[String]]) {
+    // Checking preconditions
+    precondition(0 < rows)
+    precondition(columns <= 100)
 
-    <#Write here your solution#>
+    do {
+      self.rows    = rows
+      self.columns = columns
+      self.mine    = try MineSweeperSolver.loadMineSweeper(rows, columns: columns, mine: mine)
+    } catch {
+      print(error)
+      return nil
+    }
+  }
+
+  // Simpler array management
+  subscript(row: Int, column: Int) -> String {
+    get {
+      return mine[row * columns + column]
+    }
+  }
+
+  static func loadMineSweeper(rows: Int, columns: Int, mine: [[String]]) throws -> [String] {
+    do{
+      if !(mine.count == rows || mine.map({  $0.count == columns }).contains(false)) {
+        // Mine dimensions ain't right
+        throw MineSweeperSolverException.IncorrectMineBounds
+      }
+
+      return mine.reduce([], combine: +)
+    } catch {
+      throw error
+    }
+  }
+
+  // Check for "within-bounds" possible positions (Upper Left, Upper, Upper Right ...)
+  func checkForPossiblePostions(row r: Int, column c: Int) -> [(Int, Int)] {
+    return [(r-1, c-1), (r-1, c), (r-1, c+1), (r, c-1), (r, c+1), (r+1, c-1), (r+1, c), (r+1, c+1)].filter {
+      (let pos: (row: Int, column: Int)) -> Bool in
+
+      return pos.0 >= 0 && pos.0 < self.rows && pos.1 >= 0 && pos.1 < self.columns
+    }
+  }
+
+  // Checks mines inside into adjoining positions
+  func checkMineForPosition(row: Int, column: Int) -> Int {
+    return checkForPossiblePostions(row: row, column: column).reduce(0) {
+      (var sum: Int, position: (row: Int, column: Int)) -> Int in
+
+      if (self[position.row, position.column] == "*") { sum += 1 }
+
+      return sum
+    }
+  }
+
+  // Let's do some iterations !!
+  func solveMinesweeper() -> [[String]] {
+    var result: [[String]] = []
 
+    (0..<self.rows).forEach { row in
+      var tmpRow: [String] = []
+      (0..<self.columns).forEach { column in
+        let count = self[row, column] != "*" ? String(checkMineForPosition(row, column: column)) : "*"
+        tmpRow.append(count)
+      }
+      result.append(tmpRow)
+    }
+
+    return result
+  }
+}
+
+func challenge_0002(n: Int, _ m: Int, _ field:[[String]]) -> [[String]] {
+  return MineSweeperSolver.init(rows: n, columns: m, mine: field)!.solveMinesweeper()
 }
 
 // MARK: Checks
 
 
-/*
 let result_1 = challenge_0002(4, 4, [
 ["*", ".", ".", "."],
 [".", ".", ".", "."],
@@ -62,8 +141,6 @@ let result_2 = challenge_0002(3, 5, [
 assert(result_2[0] == ["*", "*", "1", "0", "0"])
 assert(result_2[1] == ["3", "3", "2", "0", "0"])
 assert(result_2[2] == ["1", "*", "1", "0", "0"])
-*/
-
 /*:
 This problem appeared originally in programming-challenges.com
 */

Challenges/0002-Minesweeeper/Minesweeper.playground/timeline.xctimeline

@@ -3,19 +3,19 @@
    version = "3.0">
    <TimelineItems>
       <LoggerValueHistoryTimelineItem
-         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=1891&amp;EndingColumnNumber=18&amp;EndingLineNumber=0&amp;StartingColumnNumber=12&amp;StartingLineNumber=0&amp;Timestamp=476813376.273731"
+         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=4183&amp;EndingColumnNumber=18&amp;EndingLineNumber=7&amp;StartingColumnNumber=12&amp;StartingLineNumber=6&amp;Timestamp=479220843.122055"
          lockedSize = "{1430, 52}"
          selectedRepresentationIndex = "0"
          shouldTrackSuperviewWidth = "NO">
       </LoggerValueHistoryTimelineItem>
       <LoggerValueHistoryTimelineItem
-         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=1891&amp;EndingColumnNumber=40&amp;EndingLineNumber=0&amp;StartingColumnNumber=1&amp;StartingLineNumber=0&amp;Timestamp=476813376.273912"
+         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=4183&amp;EndingColumnNumber=40&amp;EndingLineNumber=7&amp;StartingColumnNumber=1&amp;StartingLineNumber=6&amp;Timestamp=479220843.122251"
          lockedSize = "{1438, 50}"
          selectedRepresentationIndex = "0"
          shouldTrackSuperviewWidth = "NO">
       </LoggerValueHistoryTimelineItem>
       <LoggerValueHistoryTimelineItem
-         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=1891&amp;EndingColumnNumber=41&amp;EndingLineNumber=0&amp;StartingColumnNumber=1&amp;StartingLineNumber=0&amp;Timestamp=476813376.274046"
+         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=4183&amp;EndingColumnNumber=41&amp;EndingLineNumber=7&amp;StartingColumnNumber=1&amp;StartingLineNumber=6&amp;Timestamp=479220843.122414"
          lockedSize = "{1439, 50}"
          selectedRepresentationIndex = "0"
          shouldTrackSuperviewWidth = "NO">