anna-oake
diff --git a/‎d2.go
Lines changed: 76 additions & 0 deletions b/‎d2.go
Lines changed: 76 additions & 0 deletions
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"math"
+	"strconv"
+	"strings"
+)
+
+func d2isReportSafe(levels []string) bool {
+	var lastDiff int64
+	for i := 1; i < len(levels); i++ {
+		last, _ := strconv.ParseInt(levels[i-1], 10, 64)
+		curr, _ := strconv.ParseInt(levels[i], 10, 64)
+		diff := curr - last
+		if math.Abs(float64(diff)) > 3 {
+			return false
+		}
+		if diff == 0 {
+			return false
+		}
+		if (diff < 0 && lastDiff > 0) || (diff > 0 && lastDiff < 0) {
+			return false
+		}
+		lastDiff = diff
+	}
+	return true
+}
+
+func d2isReportSafeDampened(levels []string, idx int) bool {
+	// yeah i know this is horrible but i literally woke up 10 minutes ago
+	// and my adhd meds havent kicked in yet and i dont wanna think
+	// i just want THE STAR
+	if idx == len(levels) {
+		return false
+	}
+	var dampened []string
+	// fuck yeah i am doing it this way. don't cry
+	for i, level := range levels {
+		if i == idx {
+			continue
+		}
+		dampened = append(dampened, level)
+	}
+	if d2isReportSafe(dampened) {
+		return true
+	}
+	return d2isReportSafeDampened(levels, idx+1)
+}
+
+func (*methods) D2P1(input string) string {
+	reports := strings.Split(input, "\n")
+
+	var safe int
+	for _, r := range reports {
+		levels := strings.Split(r, " ")
+		if d2isReportSafe(levels) {
+			safe++
+		}
+	}
+
+	return strconv.Itoa(safe)
+}
+
+func (*methods) D2P2(input string) string {
+	reports := strings.Split(input, "\n")
+
+	var safe int
+	for _, r := range reports {
+		levels := strings.Split(r, " ")
+		if d2isReportSafeDampened(levels, -1) {
+			safe++
+		}
+	}
+
+	return strconv.Itoa(safe)
+}