commit 93d505b108c52ec78824ff88c60c4960ed715e65
Author: Shimmy Xu <shimmy.xu@shimmy1996.com>
Date: Sun, 1 Dec 2019 23:16:08 -0500
Add day 01
Diffstat:
4 files changed, 156 insertions(+), 0 deletions(-)
diff --git a/README.org b/README.org
@@ -0,0 +1,6 @@
+Each folder contains
+- =input.txt=, which has the inputs.
+- =day-xx.lang=, which are solution files in different languages that prints out the answers to standard out.
+
+To run =.rs= files, compile with =rustc= and run the resulting binary.
+To run =.jl= files, run =julia day-xx.jl=.
diff --git a/day-01/day-01.jl b/day-01/day-01.jl
@@ -0,0 +1,21 @@
+input = map(x -> parse(Int32, x), readlines(open("input.txt")));
+
+function part_1(module_masses)
+ sum(module_masses) do mass
+ div(mass, 3) - 2
+ end
+end
+
+function part_2(module_masses)
+ sum(module_masses) do mass
+ fuel_cost = 0
+ while mass > 0
+ mass = div(mass, 3) - 2
+ fuel_cost += mass
+ end
+ fuel_cost
+ end
+end
+
+println("Part 1: ", part_1(input))
+println("Part 2: ", part_2(input))
diff --git a/day-01/day-01.rs b/day-01/day-01.rs
@@ -0,0 +1,29 @@
+use std::fs::File;
+use std::io::prelude::*;
+use std::io::BufReader;
+
+fn main() {
+ let input = BufReader::new(File::open("input.txt").unwrap())
+ .lines()
+ .map(|line| line.unwrap().parse::<i32>().unwrap())
+ .collect::<Vec<i32>>();
+ println!("Part 1: {}", part_1(&input));
+ println!("Part 2: {}", part_2(&input));
+}
+
+fn part_1(module_masses: &Vec<i32>) -> i32 {
+ module_masses
+ .iter()
+ .fold(0, |acc, module_mass| acc + module_mass / 3 - 2)
+}
+
+fn part_2(module_masses: &Vec<i32>) -> i32 {
+ module_masses.iter().fold(0, |mut acc, &module_mass| {
+ let mut remain_mass = module_mass;
+ while remain_mass > 0 {
+ remain_mass = remain_mass / 3 - 2;
+ acc += remain_mass;
+ }
+ acc
+ })
+}
diff --git a/day-01/input.txt b/day-01/input.txt
@@ -0,0 +1,100 @@
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+81994
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+122917
+122226