Solving Advent of Code 2019-06 with R (and no JavaScript this time).
[Disclaimer] Obviously, this post contains a big spoiler about Advent of Code, as it gives solutions for solving day 6.
Instructions
Find the instructions at: https://adventofcode.com/2019/day/6
R solution
Part one
library(magrittr)
library(igraph)
##
## Attaching package: 'igraph'
## The following objects are masked from 'package:stats':
##
## decompose, spectrum
## The following object is masked from 'package:base':
##
## union
ipt <- read.delim("input6.txt", header = FALSE, sep = ")", stringsAsFactor = FALSE)
grph <- ipt %>%
graph_from_data_frame()
grph %>%
distance_table() %>%
extract2("res") %>%
sum()
## [1] 147807
Part two
distances(
grph,
v = V(grph)[["YOU"]],
to = V(grph)[["SAN"]]
) - 2
## SAN
## YOU 229
JS solution
Nop, no JS solution today… I didn’t feel like reimplementing igraph in JavaScript, neither digging into the graph modules today ;)
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