2022 Day 4 Complete!
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2022/day04/input
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2022/day04/input
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2022/day04/main.go
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2022/day04/main.go
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package main
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import (
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"fmt"
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"strings"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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part1(inp)
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part2(inp)
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}
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func part1(inp []string) {
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fmt.Println("# Part 1")
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var ret int
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for _, pair := range inp {
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elves := strings.Split(pair, ",")
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e1S, e1E := getRange(elves[0])
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e2S, e2E := getRange(elves[1])
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if rangesFullyOverlap(e1S, e1E, e2S, e2E) {
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ret++
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}
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}
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fmt.Printf("Fully Overlapping Ranges: %d\n", ret)
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}
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func part2(inp []string) {
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fmt.Println("# Part 2")
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var ret int
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for _, pair := range inp {
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elves := strings.Split(pair, ",")
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e1S, e1E := getRange(elves[0])
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e2S, e2E := getRange(elves[1])
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if rangesOverlap(e1S, e1E, e2S, e2E) {
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ret++
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}
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}
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fmt.Printf("Overlapping Ranges: %d\n", ret)
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}
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func partXAllOverlaps(inp []string) {
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fmt.Println("# Part x")
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var overlaps int
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sections := make(map[int]int)
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for _, pair := range inp {
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elves := strings.Split(pair, ",")
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for elfIdx, elf := range elves {
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var overlapped bool
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i1, i2 := getRange(elf)
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for i := i1; i <= i2; i++ {
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if _, ok := sections[i]; ok {
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overlapped = true
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} else {
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sections[i] = elfIdx
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}
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}
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if overlapped {
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overlaps++
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}
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}
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}
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fmt.Printf("Overlapping Assignments: %d\n", overlaps)
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}
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func rangesFullyOverlap(e1start, e1end, e2start, e2end int) bool {
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return (e1start >= e2start && e1end <= e2end) ||
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(e2start >= e1start && e2end <= e1end)
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}
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func rangesOverlap(e1start, e1end, e2start, e2end int) bool {
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ret := (e1start >= e2start && e1start <= e2end) ||
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(e1end >= e2start && e1end <= e2end) ||
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(e2start >= e1start && e2start <= e1end) ||
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(e2end >= e1start && e2end <= e1end)
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return ret
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}
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func getRange(elf string) (int, int) {
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idxsS := strings.Split(elf, "-")
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return h.Atoi(idxsS[0]), h.Atoi(idxsS[1])
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}
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106
2022/day04/problem
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2022/day04/problem
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Advent of Code
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br0xen (AoC++) 7*
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--- Day 4: Camp Cleanup ---
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Space needs to be cleared before the last supplies can be unloaded from the ships, and so several Elves have been
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assigned the job of cleaning up sections of the camp. Every section has a unique ID number, and each Elf is assigned a
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range of section IDs.
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However, as some of the Elves compare their section assignments with each other, they've noticed that many of the
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assignments overlap. To try to quickly find overlaps and reduce duplicated effort, the Elves pair up and make a big list
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of the section assignments for each pair (your puzzle input).
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For example, consider the following list of section assignment pairs:
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2-4,6-8
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2-3,4-5
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5-7,7-9
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2-8,3-7
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6-6,4-6
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2-6,4-8
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For the first few pairs, this list means:
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• Within the first pair of Elves, the first Elf was assigned sections 2-4 (sections 2, 3, and 4), while the second Elf
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was assigned sections 6-8 (sections 6, 7, 8).
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• The Elves in the second pair were each assigned two sections.
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• The Elves in the third pair were each assigned three sections: one got sections 5, 6, and 7, while the other also
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got 7, plus 8 and 9.
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This example list uses single-digit section IDs to make it easier to draw; your actual list might contain larger
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numbers. Visually, these pairs of section assignments look like this:
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.234..... 2-4
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.....678. 6-8
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.23...... 2-3
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...45.... 4-5
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....567.. 5-7
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......789 7-9
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.2345678. 2-8
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..34567.. 3-7
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.....6... 6-6
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...456... 4-6
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.23456... 2-6
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...45678. 4-8
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Some of the pairs have noticed that one of their assignments fully contains the other. For example, 2-8 fully contains
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3-7, and 6-6 is fully contained by 4-6. In pairs where one assignment fully contains the other, one Elf in the pair
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would be exclusively cleaning sections their partner will already be cleaning, so these seem like the most in need of
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reconsideration. In this example, there are 2 such pairs.
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In how many assignment pairs does one range fully contain the other?
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Your puzzle answer was 503.
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The first half of this puzzle is complete! It provides one gold star: *
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--- Part Two ---
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It seems like there is still quite a bit of duplicate work planned. Instead, the Elves would like to know the number of
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pairs that overlap at all.
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In the above example, the first two pairs (2-4,6-8 and 2-3,4-5) don't overlap, while the remaining four pairs (5-7,7-9,
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2-8,3-7, 6-6,4-6, and 2-6,4-8) do overlap:
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• 5-7,7-9 overlaps in a single section, 7.
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• 2-8,3-7 overlaps all of the sections 3 through 7.
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• 6-6,4-6 overlaps in a single section, 6.
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• 2-6,4-8 overlaps in sections 4, 5, and 6.
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So, in this example, the number of overlapping assignment pairs is 4.
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In how many assignment pairs do the ranges overlap?
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Your puzzle answer was 827.
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Both parts of this puzzle are complete! They provide two gold stars: **
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At this point, you should return to your Advent calendar and try another puzzle.
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If you still want to see it, you can get your puzzle input.
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References
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Visible links
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. https://adventofcode.com/
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. https://adventofcode.com/2022/about
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. https://adventofcode.com/2022/events
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. https://adventofcode.com/2022/settings
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. https://adventofcode.com/2022/auth/logout
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. Advent of Code Supporter
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https://adventofcode.com/2022/support
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. https://adventofcode.com/2022
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. https://adventofcode.com/2022
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. https://adventofcode.com/2022/support
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. https://adventofcode.com/2022/sponsors
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. https://adventofcode.com/2022/leaderboard
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. https://adventofcode.com/2022/stats
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. https://adventofcode.com/2022/sponsors
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. https://adventofcode.com/2022/day/4/input
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6
2022/day04/testinput
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2022/day04/testinput
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2-4,6-8
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2-3,4-5
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5-7,7-9
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2-8,3-7
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6-6,4-6
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2-6,4-8
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