Browse Source

🎄 2019 Day 1 Complete! :D 🎄

master
Brian Buller 2 years ago
parent
commit
abe0af5bb7
  1. 100
      2019/day01/input
  2. 59
      2019/day01/main.go
  3. 88
      2019/day01/problem
  4. 33
      dayTemplate/main.go
  5. 6
      mkday.sh

100
2019/day01/input

@ -0,0 +1,100 @@
71764
58877
107994
72251
74966
87584
118260
144961
86889
136710
52493
131045
101496
124341
71936
88967
106520
125454
113463
81854
99918
105217
120383
61105
103842
125151
139191
143365
102168
69845
57343
93401
140910
121997
107964
53358
57397
141456
94052
127395
99180
143838
130749
126809
70165
92007
83343
55163
95270
101323
99877
105721
129657
61213
130120
108549
90539
111382
61665
95121
53216
103144
134367
101251
105118
73220
56270
50846
77314
59134
98495
113654
89711
68676
98991
109068
129630
58999
132095
98685
91762
88589
73846
124940
106944
133882
104073
78475
76545
144728
72449
118320
65363
83523
124634
96222
128252
112848
139027
108208

59
2019/day01/main.go

@ -0,0 +1,59 @@
package main
import (
"bufio"
"fmt"
"log"
"math"
"os"
"strconv"
)
func main() {
inp := StdinToStringSlice()
fmt.Println("Fuel Required:", part1(inp))
}
func part1(inp []string) int {
var total int
for _, v := range inp {
total = total + part2(fuelRequired(float64(Atoi(v))))
}
return total
}
func part2(fuel int) int {
ret := fuel
for fuel > 0 {
fuel = fuelRequired(float64(fuel))
fmt.Println(fuel)
ret = ret + fuel
}
return ret
}
func fuelRequired(mass float64) int {
res, _ := math.Modf(mass / 3)
if int(res)-2 < 0 {
return 0
}
return int(res) - 2
}
func StdinToStringSlice() []string {
var input []string
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
input = append(input, scanner.Text())
}
return input
}
func Atoi(i string) int {
var ret int
var err error
if ret, err = strconv.Atoi(i); err != nil {
log.Fatal("Invalid Atoi")
}
return ret
}

88
2019/day01/problem

@ -0,0 +1,88 @@
Advent of Code
--- Day 1: The Tyranny of the Rocket Equation ---
Santa has become stranded at the edge of the Solar System while delivering presents
to other planets! To accurately calculate his position in space, safely align his
warp drive, and return to Earth in time to save Christmas, he needs you to bring
him measurements from fifty stars.
Collect stars by solving puzzles. Two puzzles will be made available on each day in
the Advent calendar; the second puzzle is unlocked when you complete the first.
Each puzzle grants one star. Good luck!
The Elves quickly load you into a spacecraft and prepare to launch.
At the first Go / No Go poll, every Elf is Go until the Fuel Counter-Upper. They
haven't determined the amount of fuel required yet.
Fuel required to launch a given module is based on its mass. Specifically, to find
the fuel required for a module, take its mass, divide by three, round down, and
subtract 2.
For example:
* For a mass of 12, divide by 3 and round down to get 4, then subtract 2 to get
2.
* For a mass of 14, dividing by 3 and rounding down still yields 4, so the fuel
required is also 2.
* For a mass of 1969, the fuel required is 654.
* For a mass of 100756, the fuel required is 33583.
The Fuel Counter-Upper needs to know the total fuel requirement. To find it,
individually calculate the fuel needed for the mass of each module (your puzzle
input), then add together all the fuel values.
What is the sum of the fuel requirements for all of the modules on your spacecraft?
The first half of this puzzle is complete! It provides one gold star: *
--- Part Two ---
During the second Go / No Go poll, the Elf in charge of the Rocket Equation
Double-Checker stops the launch sequence. Apparently, you forgot to include
additional fuel for the fuel you just added.
Fuel itself requires fuel just like a module - take its mass, divide by three,
round down, and subtract 2. However, that fuel also requires fuel, and that fuel
requires fuel, and so on. Any mass that would require negative fuel should instead
be treated as if it requires zero fuel; the remaining mass, if any, is instead
handled by wishing really hard, which has no mass and is outside the scope of this
calculation.
So, for each module mass, calculate its fuel and add it to the total. Then, treat
the fuel amount you just calculated as the input mass and repeat the process,
continuing until a fuel requirement is zero or negative. For example:
* A module of mass 14 requires 2 fuel. This fuel requires no further fuel (2
divided by 3 and rounded down is 0, which would call for a negative fuel), so
the total fuel required is still just 2.
* At first, a module of mass 1969 requires 654 fuel. Then, this fuel requires 216
more fuel (654 / 3 - 2). 216 then requires 70 more fuel, which requires 21
fuel, which requires 5 fuel, which requires no further fuel. So, the total fuel
required for a module of mass 1969 is 654 + 216 + 70 + 21 + 5 = 966.
* The fuel required by a module of mass 100756 and its fuel is: 33583 + 11192 +
3728 + 1240 + 411 + 135 + 43 + 12 + 2 = 50346.
What is the sum of the fuel requirements for all of the modules on your spacecraft
when also taking into account the mass of the added fuel? (Calculate the fuel
requirements for each module separately, then add them all up at the end.)
References
Visible links
. https://adventofcode.com/
. https://adventofcode.com/2019/about
. https://adventofcode.com/2019/events
. https://adventofcode.com/2019/settings
. https://adventofcode.com/2019/auth/logout
. Advent of Code Supporter
https://adventofcode.com/2019/support
. https://adventofcode.com/2019
. https://adventofcode.com/2019
. https://adventofcode.com/2019/support
. https://adventofcode.com/2019/sponsors
. https://adventofcode.com/2019/leaderboard
. https://adventofcode.com/2019/stats
. https://adventofcode.com/2019/sponsors
. https://adventofcode.com/2019/day/1/input

33
dayTemplate/main.go

@ -0,0 +1,33 @@
package main
import "fmt"
func main() {
inp := StdinToStringSlice()
part1(inp)
part2(inp)
}
func part1(inp []string) {
}
func part2(inp []string) {
}
func StdinToStringSlice() []string {
var input []string
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
input = append(input, scanner.Text())
}
return input
}
func Atoi(i string) int {
var ret int
var err error
if ret, err = strconv.Atoi(i); err != nil {
log.Fatal("Invalid Atoi")
}
return ret
}

6
mkday.sh

@ -0,0 +1,6 @@
#!/bin/bash
YR=$1
DY=$2
cp -R dayTemplate "$YR/$DY"
Loading…
Cancel
Save