2022 Day 4 Complete!

2022/day04/main.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	part1(inp)
+	part2(inp)
+}
+
+func part1(inp []string) {
+	fmt.Println("# Part 1")
+	var ret int
+	for _, pair := range inp {
+		elves := strings.Split(pair, ",")
+		e1S, e1E := getRange(elves[0])
+		e2S, e2E := getRange(elves[1])
+		if rangesFullyOverlap(e1S, e1E, e2S, e2E) {
+			ret++
+		}
+	}
+	fmt.Printf("Fully Overlapping Ranges: %d\n", ret)
+}
+
+func part2(inp []string) {
+	fmt.Println("# Part 2")
+	var ret int
+	for _, pair := range inp {
+		elves := strings.Split(pair, ",")
+		e1S, e1E := getRange(elves[0])
+		e2S, e2E := getRange(elves[1])
+		if rangesOverlap(e1S, e1E, e2S, e2E) {
+			ret++
+		}
+	}
+	fmt.Printf("Overlapping Ranges: %d\n", ret)
+}
+
+func partXAllOverlaps(inp []string) {
+	fmt.Println("# Part x")
+	var overlaps int
+	sections := make(map[int]int)
+	for _, pair := range inp {
+		elves := strings.Split(pair, ",")
+		for elfIdx, elf := range elves {
+			var overlapped bool
+			i1, i2 := getRange(elf)
+			for i := i1; i <= i2; i++ {
+				if _, ok := sections[i]; ok {
+					overlapped = true
+				} else {
+					sections[i] = elfIdx
+				}
+			}
+			if overlapped {
+				overlaps++
+			}
+		}
+	}
+	fmt.Printf("Overlapping Assignments: %d\n", overlaps)
+}
+
+func rangesFullyOverlap(e1start, e1end, e2start, e2end int) bool {
+	return (e1start >= e2start && e1end <= e2end) ||
+		(e2start >= e1start && e2end <= e1end)
+}
+func rangesOverlap(e1start, e1end, e2start, e2end int) bool {
+	ret := (e1start >= e2start && e1start <= e2end) ||
+		(e1end >= e2start && e1end <= e2end) ||
+		(e2start >= e1start && e2start <= e1end) ||
+		(e2end >= e1start && e2end <= e1end)
+	return ret
+}
+
+func getRange(elf string) (int, int) {
+	idxsS := strings.Split(elf, "-")
+	return h.Atoi(idxsS[0]), h.Atoi(idxsS[1])
+}