Added Code for Day 11

Day 11: Chronal Charge
(done, but I don't like my solution)

Sources/AOC2018/day11.swift

@@ -0,0 +1,142 @@
+//
+// Advent of Code 2018 "Day 11: Chronal Charge"
+//
+
+import Foundation
+
+class Charge {
+    var grid: [Int] = []
+
+    init(withSerialNumber num: Int) {
+        grid = Array(repeating: 0, count: 300 * 300)
+        for j in 0..<300 {
+            for i in 0..<300 {
+                // grid[j * 300 + i] = 
+                let ID = i + 11
+                let power = (ID * (j + 1) + num) * ID
+                // print("power[\(i+1),\(j+1)] : \(power), \(power/1000)")
+                if power < 100 {
+                    print("_____________________>  WOW <__________________")
+                }
+                grid[j*300+i] = (power - (power/1000) * 1000 - (power % 100))/100 - 5
+                // print("\(power % 100), mynum = \(mynum)")
+                // if (i == 2) { break } 
+            }
+            // if j == 4 { break }
+        }
+    }
+
+    func getVal(for pt: (Int, Int)) -> Int {
+        return grid[(pt.1 - 1) * 300 + (pt.0 - 1)]
+    }
+
+    func sum(for pt: (Int, Int, Int)) -> Int {
+        let x = pt.0 - 1
+        let y = pt.1 - 1
+        let size = pt.2 - 1
+        var sum = 0
+        for j in y...y+size {
+            for i in x...x+size {
+                sum += grid[j*300+i]
+                // print("\(grid[j*300+i])", terminator: " ")
+            }
+            // print("")
+        }
+        // for j in pt.1-2...pt.1+2 {
+        //     for i in pt.0-2...pt.0+2 {
+        //         // print("\(grid[j*300+i])", terminator: " ")
+        //         print(NSString(format:"%4d", grid[j*300+i]), terminator: "")
+        //     }
+        //     print("")
+        // }
+        // print("sum:\(sum)")
+        return sum
+    }
+
+}
+
+class Day11: AOCDay {
+    lazy var tests: (() -> ()) = day11Tests
+    lazy var final: (() -> ()) = day11Final
+
+    func testInitCharge() {
+        let _ = Charge(withSerialNumber: 5093)
+        // let cha = Charge(withSerialNumber: 8)
+    }
+
+    func testPoint() {
+        var cha = Charge(withSerialNumber: 57)
+        var val = cha.getVal(for: (122, 79))
+        XCTAssertEqual(test: "testPoint (122,79)", withExpression: (val  == -5))
+        cha = Charge(withSerialNumber: 39)
+        val = cha.getVal(for: (217, 196))
+        XCTAssertEqual(test: "testPoint (217,196)", withExpression: (val  == 0))
+        cha = Charge(withSerialNumber: 71)
+        val = cha.getVal(for: (101, 153))
+        XCTAssertEqual(test: "testPoint (101,153)", withExpression: (val  == 4))
+    }
+
+    func testSum() {
+        var cha = Charge(withSerialNumber: 18)
+        var sum = cha.sum(for: (33, 45, 3))
+        XCTAssertEqual(test: "testSum (33,45)", withExpression: (sum  == 29))
+        cha = Charge(withSerialNumber: 42)
+        sum = cha.sum(for: (21, 61, 3))
+        XCTAssertEqual(test: "testSum (21,61)", withExpression: (sum  == 30))
+    }
+
+    func day11Tests() {
+        testInitCharge()
+        testPoint()
+        testSum()
+    }
+
+    func day11Final() {
+        // let retVal = "None"
+        let cha = Charge(withSerialNumber: 5093)
+        var maxSum = 0
+        var maxCoord = (0,0)
+        for y in 1...298 {
+            for x in 1...298 {
+                let sum = cha.sum(for: (x, y, 3))
+                if sum > maxSum {
+                    maxSum = sum
+                    maxCoord = (x, y)
+                }
+            }
+        }
+
+        print("Answer to part 1 is: \(maxCoord)")
+
+        var maxSize = 0
+        var outerMaxSum = 0
+        var outerMaxCoord = (0,0)
+        for size in 1...300 {
+            maxSum = 0
+            maxCoord = (0,0)
+            for y in 1...300 - size + 1 {
+                for x in 1...300 - size + 1 {
+                    let sum = cha.sum(for: (x, y, size))
+                    if sum > maxSum {
+                        maxSum = sum
+                        maxCoord = (x, y)
+                    }
+                }
+            }
+            if maxSum > outerMaxSum {
+                outerMaxSum = maxSum
+                outerMaxCoord = maxCoord
+                maxSize = size
+            }
+            print("\(outerMaxCoord), \(maxSize)")
+        }
+        print("Answer to part 2 is: \(outerMaxCoord), \(maxSize)")
+    }
+}
+
+// RackID = X + 10
+// Power = RackID * Y
+// Power += SerialNumber
+// Power *= Power * RackID
+// Power = "hundreds digit"
+// Power -= 5

Sources/AOC2018/main.swift

@@ -5,7 +5,7 @@
 import Foundation
 
 let showTests = true
-let onlyOneDay = 10
+let onlyOneDay = 11
 var allTests: [(() -> ())] = []
 var allFinal: [(() -> ())] = []
 
@@ -22,6 +22,7 @@ allTests.append(Day07().tests)
 allTests.append(Day08().tests)
 allTests.append(Day09().tests)
 allTests.append(Day10().tests)
+allTests.append(Day11().tests)
 
 // Compile list of Answers
 allFinal.append(Day01().final)
@@ -34,6 +35,7 @@ allFinal.append(Day07().final)
 allFinal.append(Day08().final)
 allFinal.append(Day09().final)
 allFinal.append(Day10().final)
+allFinal.append(Day11().final)
 
 if onlyOneDay > 0 {
     print("\nDay \(onlyOneDay)")