Advent of Code 2023, Day 1 Solution https://adventofcode.com/2023/day/1

advent1.md

title	author	date	output
Advent of Code 2023 Day 1	Kory Becker	`r Sys.Date()`	html_document

knitr::opts_chunk$set(echo = TRUE)

if (!require(stringr)) {
  install.packages("stringr")
  library(stringr)
}

Advent of Code 2023, Day 1

This document contains a solution to Day 1 of Advent of Code 2023.

Read the data

First, we'll save the input file and read the data.

data <- read.csv('input.txt', header=F, col.names = 'codes')
head(data)

Collect first and last digit from each code

The next step is to enumerate all codes, extract the first and (optional) last digit, and add the resulting values together.

result <- lapply(seq(nrow(data)), function(i) {
  code <- data[i,]
  
  digits <- str_extract_all(code, "\\d")[[1]]
  
  first_digit <- digits[1]
  last_digit <- tail(digits, n = 1)
  
  c(first_digit = first_digit, last_digit = last_digit, combined = paste0(first_digit, last_digit))
})

Sum the values of all digits

The final step is to sum the resulting values to produce the final answer.

values <- lapply(seq(result), function(i) {
  value <- as.integer(result[[i]]['combined'])
  c(value)
})

print(sum(unlist(values)))

56042

Second Part - replace spelled numbers with actual numbers and recalculate

Note, we insert the integer representation of the spelled digit in the middle of the word. This is due to the fact that some digits begin with the last letter of the previous digit, such as nineight. In this case, our replacement becomes nin9eigh8t.

Since we extract the digits into an array, this replacement does not affect the result.

result2 <- lapply(seq(nrow(data)), function(i) {
  code <- data[i,]
  
  code <- str_replace_all(code, c('one' = 'on1e', 'two' = 'tw2o', 'three' = 'thre3e', 
                                 'four' = 'fou4r', 'five' = 'fiv5e', 'six' = 'si6x', 
                                 'seven' = 'seve7n', 'eight' = 'eigh8t', 'nine' = 'nin9e'))

  digits <- str_extract_all(code, "\\d")[[1]]
  
  first_digit <- digits[1]
  last_digit <- tail(digits, n = 1)
  
  c(first_digit = first_digit, last_digit = last_digit, combined = paste0(first_digit, last_digit))
})

values2 <- lapply(seq(result2), function(i) {
  value <- as.integer(result2[[i]]['combined'])
  c(value)
})

print(sum(unlist(values2)))

55358

input.txt

99lbqpxzzlbtvkmfrvrnmcxttseven
q7cnfslbtpkvseven
6threezlljtzcr1sdjkthree4cx
21xfxfourmzmqbqp1
lkdbjd5
8three27
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mdmvbhqjt5rkfpcnfvzhkkfbjvh8three9
four32
seven6pljhqnineeightjjsvnqblk8eight
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ntvhxqzsixxcrfpgstwo915onevxz
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six8flfzdzl72eightnine
sevensevenzsztgvh4sixbzltzl
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four53ninedrjllgffrfrtjgggvknine
nineonecxpzzqsptc7nv9pck
sixrqqfkcjrqkppvqthree1
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75349sixnhxjpgtnhqlf
9963onefourthree6oneightq
51fp
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mbbkjxfthreetwoqlcrjnlvkrgnine41vkjknnmtv
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