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2022 Day 16
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‎2022/R/day16.qmd

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@@ -27,14 +27,135 @@ input <- read_lines("../input/day16.txt", skip_empty_rows = TRUE) |>
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## Part 1
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Represent tunnels and valves as a graph:
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```{r}
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edges <- input |>
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g <- input |>
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unnest(target) |>
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pmap(function(source, target, ...) c(source, target)) |>
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unique() |>
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unlist() |>
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make_graph(directed = TRUE)
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make_graph(directed = TRUE) |>
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as_undirected()
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```
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Get the list of valves with nonzero flow:
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```{r}
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flows <- input |>
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filter(rate > 0 | source == "AA") |>
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select(source, rate) |>
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deframe()
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non_init_flows <- flows |>
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discard_at("AA")
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valves <- names(flows)
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dists <- distances(g, valves, valves)
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```
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List all permutations of possible valves to visit with a total distance less than 30:
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```{r}
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get_path <- function(choices, last, cur_length, max_length) {
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if (cur_length >= max_length)
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return(head(last, -1))
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if (length(choices) == 0)
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return(last)
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ls <- list()
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for (valve in choices) {
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ls <- append(
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ls,
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list(get_path(
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choices[choices != valve],
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c(last, valve),
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cur_length + dists[tail(last, 1), valve] + 1,
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max_length
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))
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)
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}
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ls |>
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discard(is_null) |>
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list_flatten() |>
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unique()
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}
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combos <- get_path(names(non_init_flows), names(flows["AA"]), 0, 30)
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```
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Compute total pressure released for each permutation:
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```{r}
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get_pressures <- function(paths, max_time) {
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map_dbl(paths, \(path) {
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valve <- tail(path, -1)
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valve_lag <- head(path, -1)
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flow <- tail(flows[path], -1)
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dist <- map2_int(valve_lag, valve, \(src, target) dists[src, target])
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time_start <- cumsum(dist) + 1:length(dist) + 1
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pressure <- (max_time - time_start + 1) * flow
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sum(pressure[time_start <= max_time])
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})
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}
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pressures <- get_pressures(combos, 30)
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```
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Find the permutation that gives the maximum pressure:
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```{r}
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max_idx <- which.max(pressures)
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pressures[max_idx]
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```
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## Part 2
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List all permutations of possible valves to visit with a total distance less than 26:
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```{r}
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el_combos <- get_path(names(non_init_flows), names(flows["AA"]), 0, 26)
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el_pressures <- get_pressures(el_combos, 26)
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```
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For each set of permutations, get the best pressure.
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```{r}
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el_best <- tibble(valves = map(el_combos, sort), pressure = el_pressures) |>
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slice_max(pressure, by = valves, with_ties = FALSE)
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```
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Get best combinations of permutations between yourself and the elephant:
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```{r}
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el_best |>
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rename(el_valves = valves, el_pressure = pressure) |>
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pmap_dbl(\(el_valves, el_pressure) {
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el_valves <- el_valves[el_valves != "AA"]
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el_pressure + el_best |>
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filter(map_lgl(valves, ~ length(intersect(.x, el_valves)) == 0)) |>
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pull(pressure) |>
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max()
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}) |>
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max()
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plot(edges)
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```
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‎2022/R/day17.qmd

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---
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title: "Day 17"
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date: 2022-12-17
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author:
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name: https://adventofcode.com/2022/day/17
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url: https://adventofcode.com/2022/day/17
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---
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## Setup
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```{r setup}
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# Libraries
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library(tidyverse)
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# Read input from file
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input <- read_lines("../input/day17.txt", skip_empty_rows = TRUE)
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```
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```{r}
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```
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‎2022/input/day16.txt

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Valve AA has flow rate=0; tunnels lead to valves DD, II, BB
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Valve BB has flow rate=13; tunnels lead to valves CC, AA
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Valve CC has flow rate=2; tunnels lead to valves DD, BB
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Valve DD has flow rate=20; tunnels lead to valves CC, AA, EE
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Valve EE has flow rate=3; tunnels lead to valves FF, DD
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Valve FF has flow rate=0; tunnels lead to valves EE, GG
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Valve GG has flow rate=0; tunnels lead to valves FF, HH
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Valve HH has flow rate=22; tunnel leads to valve GG
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Valve II has flow rate=0; tunnels lead to valves AA, JJ
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Valve JJ has flow rate=21; tunnel leads to valve II
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Valve RT has flow rate=0; tunnels lead to valves EN, LZ
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Valve VB has flow rate=0; tunnels lead to valves SZ, BF
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Valve AD has flow rate=0; tunnels lead to valves EB, JF
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Valve RE has flow rate=4; tunnels lead to valves QB, IF, XT, WF, KW
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Valve RL has flow rate=0; tunnels lead to valves DQ, LZ
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Valve OK has flow rate=0; tunnels lead to valves QH, BF
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Valve RV has flow rate=0; tunnels lead to valves IU, JF
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Valve TE has flow rate=0; tunnels lead to valves HE, XF
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Valve WW has flow rate=0; tunnels lead to valves QH, YZ
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Valve HB has flow rate=15; tunnel leads to valve OM
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Valve IY has flow rate=14; tunnels lead to valves UH, KW, BN, LW, UY
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Valve QF has flow rate=0; tunnels lead to valves JF, PL
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Valve YZ has flow rate=0; tunnels lead to valves JG, WW
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Valve QB has flow rate=0; tunnels lead to valves SP, RE
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Valve SO has flow rate=0; tunnels lead to valves QH, SZ
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Valve EB has flow rate=7; tunnels lead to valves IF, NH, AD, VI, DQ
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Valve VL has flow rate=0; tunnels lead to valves JF, YV
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Valve BF has flow rate=18; tunnels lead to valves OK, VB, OH, SX
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Valve UC has flow rate=0; tunnels lead to valves SC, YV
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Valve OQ has flow rate=0; tunnels lead to valves XT, AA
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Valve YV has flow rate=6; tunnels lead to valves YX, TT, VL, UC, NH
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Valve KJ has flow rate=0; tunnels lead to valves OH, JG
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Valve QH has flow rate=20; tunnels lead to valves SO, OK, WW
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Valve KW has flow rate=0; tunnels lead to valves RE, IY
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Valve PL has flow rate=0; tunnels lead to valves JG, QF
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Valve DQ has flow rate=0; tunnels lead to valves EB, RL
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Valve AA has flow rate=0; tunnels lead to valves YI, EN, UK, OQ, VI
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Valve XT has flow rate=0; tunnels lead to valves OQ, RE
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Valve SZ has flow rate=24; tunnels lead to valves VB, SO
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Valve IU has flow rate=25; tunnels lead to valves RV, HE, HQ
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Valve OM has flow rate=0; tunnels lead to valves NY, HB
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Valve YX has flow rate=0; tunnels lead to valves YV, SI
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Valve SX has flow rate=0; tunnels lead to valves ZB, BF
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Valve KD has flow rate=0; tunnels lead to valves XF, LW
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Valve SP has flow rate=0; tunnels lead to valves XF, QB
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Valve UY has flow rate=0; tunnels lead to valves UK, IY
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Valve XF has flow rate=22; tunnels lead to valves SP, TE, KD, NY
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Valve SC has flow rate=0; tunnels lead to valves LZ, UC
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Valve UK has flow rate=0; tunnels lead to valves UY, AA
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Valve LW has flow rate=0; tunnels lead to valves KD, IY
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Valve FL has flow rate=0; tunnels lead to valves BN, LZ
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Valve VI has flow rate=0; tunnels lead to valves AA, EB
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Valve HW has flow rate=0; tunnels lead to valves JF, CY
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Valve YI has flow rate=0; tunnels lead to valves AA, TT
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Valve HE has flow rate=0; tunnels lead to valves IU, TE
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Valve JG has flow rate=10; tunnels lead to valves PL, YZ, SI, KJ
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Valve BN has flow rate=0; tunnels lead to valves IY, FL
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Valve IF has flow rate=0; tunnels lead to valves EB, RE
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Valve JF has flow rate=19; tunnels lead to valves HW, QF, VL, RV, AD
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Valve SI has flow rate=0; tunnels lead to valves JG, YX
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Valve WF has flow rate=0; tunnels lead to valves LZ, RE
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Valve HQ has flow rate=0; tunnels lead to valves IU, UH
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Valve LZ has flow rate=5; tunnels lead to valves SC, FL, WF, RL, RT
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Valve UH has flow rate=0; tunnels lead to valves IY, HQ
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Valve CY has flow rate=21; tunnel leads to valve HW
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Valve NH has flow rate=0; tunnels lead to valves EB, YV
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Valve TT has flow rate=0; tunnels lead to valves YV, YI
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Valve OH has flow rate=0; tunnels lead to valves KJ, BF
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Valve EN has flow rate=0; tunnels lead to valves RT, AA
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Valve NY has flow rate=0; tunnels lead to valves OM, XF
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Valve ZB has flow rate=8; tunnel leads to valve SX

‎_freeze/2022/R/day16/execute-results/html.json

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{
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"hash": "6a25bc5739310e419033dcbae5670a06",
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"hash": "ba1db0b8363fc37a2239575abad8dd21",
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"result": {
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"engine": "knitr",
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"markdown": "---\ntitle: \"Day 16\"\ndate: 2022-12-16\nauthor:\n name: https://adventofcode.com/2022/day/16\n url: https://adventofcode.com/2022/day/16\n---\n\n\n\n\n\n## Setup\n\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\n# Libraries\nlibrary(tidyverse)\nlibrary(igraph)\n\n# Read input from file\ninput <- read_lines(\"../input/day16.txt\", skip_empty_rows = TRUE) |> \n unglue::unglue_data(\n c(\n \"Valve {source} has flow rate={rate}; tunnels lead to valves {target}\",\n \"Valve {source} has flow rate={rate}; tunnel leads to valve {target}\"\n ),\n convert = TRUE\n ) |> \n mutate(target = map(target, \\(x) str_split_1(x, \", \")))\n```\n:::\n\n\n\n\n\n## Part 1\n\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\nedges <- input |>\n unnest(target) |> \n pmap(function(source, target, ...) c(source, target)) |> \n unique() |> \n unlist() |> \n make_graph(directed = TRUE)\n\nplot(edges)\n```\n\n::: {.cell-output-display}\n![](day16_files/figure-html/unnamed-chunk-1-1.png){width=672}\n:::\n:::\n",
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"markdown": "---\ntitle: \"Day 16\"\ndate: 2022-12-16\nauthor:\n name: https://adventofcode.com/2022/day/16\n url: https://adventofcode.com/2022/day/16\n---\n\n\n\n\n## Setup\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\n# Libraries\nlibrary(tidyverse)\nlibrary(igraph)\n\n# Read input from file\ninput <- read_lines(\"../input/day16.txt\", skip_empty_rows = TRUE) |> \n unglue::unglue_data(\n c(\n \"Valve {source} has flow rate={rate}; tunnels lead to valves {target}\",\n \"Valve {source} has flow rate={rate}; tunnel leads to valve {target}\"\n ),\n convert = TRUE\n ) |> \n mutate(target = map(target, \\(x) str_split_1(x, \", \")))\n```\n:::\n\n\n\n\n## Part 1\n\nRepresent tunnels and valves as a graph:\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\ng <- input |>\n unnest(target) |> \n pmap(function(source, target, ...) c(source, target)) |> \n unique() |> \n unlist() |> \n make_graph(directed = TRUE) |> \n as_undirected()\n```\n:::\n\n\n\n\nGet the list of valves with nonzero flow:\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\nflows <- input |> \n filter(rate > 0 | source == \"AA\") |> \n select(source, rate) |> \n deframe()\n\nnon_init_flows <- flows |> \n discard_at(\"AA\")\n\nvalves <- names(flows)\n\ndists <- distances(g, valves, valves)\n```\n:::\n\n\n\n\nList all permutations of possible valves to visit with a total distance less than 30:\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\nget_path <- function(choices, last, cur_length, max_length) {\n if (cur_length >= max_length)\n return(head(last, -1))\n if (length(choices) == 0)\n return(last)\n \n ls <- list()\n for (valve in choices) {\n ls <- append(\n ls, \n list(get_path(\n choices[choices != valve], \n c(last, valve), \n cur_length + dists[tail(last, 1), valve] + 1,\n max_length\n ))\n )\n }\n ls |> \n discard(is_null) |> \n list_flatten() |> \n unique()\n}\n\ncombos <- get_path(names(non_init_flows), names(flows[\"AA\"]), 0, 30)\n```\n:::\n\n\n\n\nCompute total pressure released for each permutation:\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\nget_pressures <- function(paths, max_time) {\n map_dbl(paths, \\(path) {\n valve <- tail(path, -1)\n valve_lag <- head(path, -1)\n flow <- tail(flows[path], -1)\n \n dist <- map2_int(valve_lag, valve, \\(src, target) dists[src, target])\n time_start <- cumsum(dist) + 1:length(dist) + 1\n pressure <- (max_time - time_start + 1) * flow\n \n sum(pressure[time_start <= max_time])\n })\n}\n\npressures <- get_pressures(combos, 30)\n```\n:::\n\n\n\n\nFind the permutation that gives the maximum pressure:\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\nmax_idx <- which.max(pressures)\npressures[max_idx]\n```\n\n::: {.cell-output .cell-output-stdout}\n\n```\n[1] 1947\n```\n\n\n:::\n:::\n\n\n\n\n## Part 2\n\nList all permutations of possible valves to visit with a total distance less than 26:\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\nel_combos <- get_path(names(non_init_flows), names(flows[\"AA\"]), 0, 26)\nel_pressures <- get_pressures(el_combos, 26)\n```\n:::\n\n\n\n\nFor each set of permutations, get the best pressure.\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\nel_best <- tibble(valves = map(el_combos, sort), pressure = el_pressures) |> \n slice_max(pressure, by = valves, with_ties = FALSE)\n```\n:::\n\n\n\n\nGet best combinations of permutations between yourself and the elephant:\n\n\n\n\n::: {.cell}\n\n```{.r .cell-code}\nel_best |> \n rename(el_valves = valves, el_pressure = pressure) |> \n pmap_dbl(\\(el_valves, el_pressure) {\n el_valves <- el_valves[el_valves != \"AA\"]\n el_pressure + el_best |>\n filter(map_lgl(valves, ~ length(intersect(.x, el_valves)) == 0)) |> \n pull(pressure) |> \n max()\n }) |> \n max()\n```\n\n::: {.cell-output .cell-output-stdout}\n\n```\n[1] 2556\n```\n\n\n:::\n:::\n",
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"supporting": [
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"day16_files"
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],

‎_freeze/site_libs/quarto-listing/list.min.js

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