Solve 2020/3/2

2020/3/main.go

@@ -46,7 +46,32 @@ func first(lines []string) interface{} {
 }
 
 func second(lines []string) interface{} {
-	result := 0
 
-	return result
+	return traverse(lines, 1, 1) * traverse(lines, 3, 1) * traverse(lines, 5, 1) * traverse(lines, 7, 1) * traverse(lines, 1, 2)
+}
+
+func traverse(lines []string, xoff int, yoff int) int {
+	currentX := 0
+	numTrees := 0
+	for i := 0; i < len(lines); i += yoff {
+		line := lines[i]
+		if i == 0 {
+			continue
+		}
+
+		currentX += xoff
+
+		objects := strings.Split(line, "")
+
+		if currentX >= len(objects) {
+			currentX %= len(objects)
+		}
+
+		if objects[currentX] == "#" {
+			numTrees++
+		}
+
+	}
+
+	return numTrees
 }