3 solution

Author: steixeira-ias

src/Day03.kt

@@ -0,0 +1,49 @@
+
+fun main() {
+    var lines = readInput("files/day03")
+
+    // find all matches for mul(digits,digits)
+    val regex = """mul\((?<first>\d+),(?<second>\d+)\)""".toRegex()
+    var total = 0
+//    lines.map{ line:String ->
+//        var matchResult = regex.find(line)
+//
+//        if (matchResult != null) {
+//            while(matchResult?.groups?.get("first") != null) {
+//                val first = matchResult.groups["first"]?.value?.toInt()
+//                val second = matchResult.groups["second"]?.value?.toInt()
+//                total += first!! * second!!
+//
+//                matchResult = matchResult.next()
+//            }
+//        }
+//    }
+//    println(total)
+
+    // part 2
+
+    val regex2 = """don't.*?do\(\)""".toRegex()
+    val regex3 = """don't.*$""".toRegex()
+
+    total = 0;
+    lines.map{ line:String ->
+        println(line)
+        var replaced = line.replace(regex2, "")
+        replaced = replaced.replace(regex3, "")
+        println(replaced)
+        println("------")
+        var matchResult = regex.find(replaced)
+
+        if (matchResult != null) {
+            while(matchResult?.groups?.get("first") != null) {
+                val first = matchResult!!.groups["first"]?.value?.toInt()
+                val second = matchResult!!.groups["second"]?.value?.toInt()
+                total += first!! * second!!
+
+                matchResult = matchResult!!.next()
+            }
+        }
+    }
+
+    println(total)
+}