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day19.R
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day19.R
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# Decription of script ---------------------------------------------------------
# Day 19 advent of code -- Monster Messages
# ------------------------------------------------------------------------------
# set up -----------------------------------------------------------------------
library(tidyverse)
#%_% load data --------------------------------------------------------------------
rules <- read_delim('day19_a.txt', delim = ":", col_names = FALSE)
entries <- read_csv('day19_b.txt', col_names = FALSE)
names(rules) <- c("rule_number", "rule")
rules$rule <- str_trim(rules$rule)
rules <- rules %>%
mutate(rule_number = as.numeric(rule_number)) %>%
arrange(rule_number)
# solve the puzzle ------------------------------------------------------------
# part 1
format_regex <- function(rule_i){
if (is.na(rule_i)){
return(NA)
}
else{
rule_i <- which(rules$rule_number == rule_i)
if (rules[rule_i, ]$rule %in% c("a", "b")){
return(rules[rule_i, ]$rule)
} else {
# find the right format for the rules
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule2", "rule3"),
'(\\d+) (\\d+) (\\d+)')
if (is.na(sum(as.numeric(extract_rules)))){
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule2", "rule3", "rule4"),
'(\\d+) (\\d+) \\| (\\d+) (\\d+)')
}
if (is.na(sum(as.numeric(extract_rules)))){
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule2"),
'(\\d+) (\\d+)')
}
if (is.na(sum(as.numeric(extract_rules)))){
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule3"),
'(\\d+) \\| (\\d+)')
}
if (is.na(sum(as.numeric(extract_rules)))){
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1"),
'(\\d+)')
}
if(ncol(extract_rules) == 3 & length(extract_rules$rule2) > 0){
extract_rules <- extract_rules %>%
mutate(rule3 = NA, rule4 = NA)
} else if(ncol(extract_rules) == 3 & length(extract_rules$rule2) == 0){
extract_rules <- extract_rules %>%
mutate(rule2 = NA, rule4 = NA)
} else if(ncol(extract_rules) == 2){
extract_rules <- extract_rules %>%
mutate(rule2 = NA, rule3 = NA, rule4 = NA)
} else if(ncol(extract_rules) == 4){
extract_rules <- extract_rules %>%
mutate(rule4 = NA)
}
}
if(!is.na(extract_rules$rule3) & is.na(extract_rules$rule4) & !is.na(extract_rules$rule2)){
return(paste0("(", format_regex(as.numeric(extract_rules$rule1)), ")(",
format_regex(as.numeric(extract_rules$rule2)), ")(",
format_regex(as.numeric(extract_rules$rule3)), ")"))
} else{
left_rule <- c(format_regex(as.numeric(extract_rules$rule1)), format_regex(as.numeric(extract_rules$rule2)))
left_rule <- paste0(left_rule[!is.na(left_rule)], collapse = "")
right_rule <- c(format_regex(as.numeric(extract_rules$rule3)), format_regex(as.numeric(extract_rules$rule4)))
right_rule <- paste0(right_rule[!is.na(right_rule)], collapse = "")
return(paste0("(", left_rule, "|", right_rule, ")"))
}
}
}
all_rules <- paste0("^", format_regex(0), "$")
all_rules <- gsub("|)", ")", all_rules, fixed = TRUE)
sum(str_detect(entries$X1, all_rules))
# part 2
rules <- read_delim('day19_c.txt', delim = ":", col_names = FALSE)
names(rules) <- c("rule_number", "rule")
rules$rule <- str_trim(rules$rule)
rules <- rules %>%
mutate(rule_number = as.numeric(rule_number)) %>%
arrange(rule_number)
format_regex <- function(rule_i){
if (is.na(rule_i)){
return(NA)
} else if (!rule_i %in% c(8,11)){ # treat 8 and 11 differently
rule_i <- which(rules$rule_number == rule_i)
if (rules[rule_i, ]$rule %in% c("a", "b")){
return(rules[rule_i, ]$rule)
} else {
# find the right format for the rules
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule2", "rule3"),
'(\\d+) (\\d+) (\\d+)')
if (is.na(sum(as.numeric(extract_rules)))){
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule2", "rule3", "rule4"),
'(\\d+) (\\d+) \\| (\\d+) (\\d+)')
}
if (is.na(sum(as.numeric(extract_rules)))){
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule2"),
'(\\d+) (\\d+)')
}
if (is.na(sum(as.numeric(extract_rules)))){
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule3"),
'(\\d+) \\| (\\d+)')
}
if (is.na(sum(as.numeric(extract_rules)))){
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1"),
'(\\d+)')
}
if(ncol(extract_rules) == 3 & length(extract_rules$rule2) > 0){
extract_rules <- extract_rules %>%
mutate(rule3 = NA, rule4 = NA)
} else if(ncol(extract_rules) == 3 & length(extract_rules$rule2) == 0){
extract_rules <- extract_rules %>%
mutate(rule2 = NA, rule4 = NA)
} else if(ncol(extract_rules) == 2){
extract_rules <- extract_rules %>%
mutate(rule2 = NA, rule3 = NA, rule4 = NA)
} else if(ncol(extract_rules) == 4){
extract_rules <- extract_rules %>%
mutate(rule4 = NA)
}
}
if(!is.na(extract_rules$rule3) & is.na(extract_rules$rule4) & !is.na(extract_rules$rule2)){
return(paste0("(", format_regex(as.numeric(extract_rules$rule1)), ")(",
format_regex(as.numeric(extract_rules$rule2)), ")(",
format_regex(as.numeric(extract_rules$rule3)), ")"))
} else{
left_rule <- c(format_regex(as.numeric(extract_rules$rule1)), format_regex(as.numeric(extract_rules$rule2)))
left_rule <- paste0(left_rule[!is.na(left_rule)], collapse = "")
right_rule <- c(format_regex(as.numeric(extract_rules$rule3)), format_regex(as.numeric(extract_rules$rule4)))
right_rule <- paste0(right_rule[!is.na(right_rule)], collapse = "")
return(paste0("(", left_rule, "|", right_rule, ")"))
}
} else {
rule_i <- which(rules$rule_number == rule_i)
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule2", "rule3", "rule4", "rule5"),
'(\\d+) (\\d+) \\| (\\d+) (\\d+) (\\d+)')
if (!is.na(sum(as.numeric(extract_rules)))){
return(paste0("(", format_regex(as.numeric(extract_rules$rule1)), "){", 1:10, "}(", format_regex(as.numeric(extract_rules$rule2)), "){", 1:10, "}") %>%
paste(collapse = "|") %>%
paste0("(", ., ")"))
} else {
extract_rules <- rules[rule_i,] %>%
extract(rule, c("rule1", "rule2", "rule3"),
'(\\d+) \\| (\\d+) (\\d+)')
return(paste0("(", format_regex(as.numeric(extract_rules$rule1)), "+)"))
}
}
}
all_rules <- paste0("^", format_regex(0), "$")
all_rules <- gsub("|)", ")", all_rules, fixed = TRUE)
sum(str_detect(entries$X1, all_rules))