Finish Day 3

Sources/AOC2018/day03.swift

@@ -21,8 +21,9 @@ struct ElfSquare {
 // lay down all the claims
 // count the overlapping cells
 class Slice {
-    var fabric: [[Int]] = []          // var threeDoubles = Array(repeating: 0.0, count: 3)
+    var fabric: [[Int]] = []
     var claims: [ElfSquare] = []
+    var corruptedClaims: [Int : Bool] = [:]     // build list of claims that overlap
 
 
     // Supply filename for input ex: '/home/peterr/AOC2018/Sources/AOC2018/data/day03.txt'
@@ -63,14 +64,12 @@ class Slice {
             claim.removeFirst()
             claim = claim.replacingOccurrences(of: " ", with: "")
             claim = claim.replacingOccurrences(of: "@", with: ":")
-            // print("modified claim : \(claim)")
             var parts = claim.components(separatedBy: ":")
-            // print("Parts = \(parts)")
             square.ID = Int(parts[0]) ?? -1
             square.loc = getTuple(from: parts[1], withSeparator: ",")
             square.size = getTuple(from: parts[2], withSeparator: "x")
             claims.append(square)
-            // print("square = \(square)")
+            corruptedClaims[square.ID] = false
         }
     }
 
@@ -97,6 +96,10 @@ class Slice {
         for j in claim.loc.fromTop..<(claim.loc.fromTop+claim.size.height) {
             for i in claim.loc.fromLeft..<(claim.loc.fromLeft+claim.size.width) {
                 if fabric[j][i] != 0 {
+                    if fabric[j][i] > 0 {
+                        corruptedClaims[fabric[j][i]] = true
+                    }
+                    corruptedClaims[claim.ID] = true
                     fabric[j][i] = -1
                 } else {
                     fabric[j][i] = claim.ID
@@ -106,7 +109,23 @@ class Slice {
     }
 
     // count the overlapping cells
-    func countOverlappingFrames() {
+    func countOverlappingClaims() -> Int {
+        var retVal = 0
+        if fabric.count == 0 {
+            _ = getFabricSize()
+        }
+        for claim in claims {
+            apply(claim: claim)
+        }
+        for row in fabric {
+            retVal += row.filter { $0 == -1 }.count
+        }
+        return retVal
+    }
+
+    // Find the one cell that does not overlap
+    func findUncorruptedClaim() -> Int {
+        return corruptedClaims.filter{ $0.value == false }.keys.first ?? -1
     }
 
 }
@@ -156,8 +175,7 @@ class Day03: AOCDay {
     func testGetFabricSize() {
         let slice = Slice(withString: testSample)
         let dims = slice.getFabricSize()
-        print("dimensions = \(dims)")
-        XCTAssertEqual(test: "testGetFabricSize", withExpression: (dims == (7, 7)))
+        XCTAssertEqual(test: "testGetFabricSize", withExpression: (dims == (8, 8)))
     }
 
     // lay down all the claims
@@ -178,6 +196,16 @@ class Day03: AOCDay {
 
     // count the overlapping cells
     func testCountOverlappingFrames() {
+        let slice = Slice(withString: testSample)
+        let overlapArea = slice.countOverlappingClaims()
+        XCTAssertEqual(test: "testCountOverlappingFrames", withExpression: (overlapArea == 4))
+    }
+
+    func testFindUncorruptedClaim() {
+        let slice = Slice(withString: testSample)
+        _ = slice.countOverlappingClaims()
+        let uncorruptedClaimID = slice.findUncorruptedClaim()
+        XCTAssertEqual(test: "testFindUncorruptedClaim", withExpression: (uncorruptedClaimID == 3))
     }
 
     func day03Tests() {
@@ -186,11 +214,13 @@ class Day03: AOCDay {
         testGetFabricSize()
         testApplyClaim()
         testCountOverlappingFrames()
+        testFindUncorruptedClaim()
     }
 
     func day03Final() {
-        let retVal = "None"
-        print("Answer to part 1 is: \(retVal)")
-        print("Answer to part 2 is: \(retVal)")
+        let slice = Slice(withFile: "/home/peterr/AOC2018/Sources/AOC2018/data/day03.txt")
+        let overlapArea = slice.countOverlappingClaims()
+        print("Answer to part 1 is: \(overlapArea)")
+        print("Answer to part 2 is: \(slice.findUncorruptedClaim())")
     }
 }

Sources/AOC2018/main.swift

@@ -5,7 +5,7 @@
 import Foundation
 
 let showTests = true
-let onlyOneDay = 3
+let onlyOneDay = 0
 var allTests: [(() -> ())] = []
 var allFinal: [(() -> ())] = []