2019 Day 14 Complete

master
Brian Buller 3 years ago
parent 45602e82c2
commit 5d8cf97902
  1. 59
      2019/day14/main.go

@ -2,6 +2,7 @@ package main
import (
"fmt"
"math"
"strings"
helpers "git.bullercodeworks.com/brian/adventofcode/helpers"
@ -29,6 +30,64 @@ func part1(inp []string) {
}
func part2(inp []string) {
fuel := GetMaxFuelForOre(inp, 1000000000000)
fmt.Println("# Part 2")
fmt.Println("Fuel:", fuel)
}
func FindRequiredOre(inp []string, fuel int) int {
allReactions := make(map[string]*Reaction)
for _, v := range inp {
r := NewReaction(v)
allReactions[r.out] = r
}
return Produce("FUEL", fuel, allReactions, make(map[string]int))
}
func Produce(chem string, amt int, allReactions map[string]*Reaction, excess map[string]int) int {
if chem == "ORE" {
return amt
}
if excess[chem] >= amt {
excess[chem] -= excess[chem]
excess[chem] = 0
}
recipe := allReactions[chem]
times := int(math.Ceil(float64(amt) / float64(recipe.outQty)))
ret := 0
for k, inAmt := range recipe.in {
ret += Produce(k, inAmt*times, allReactions, excess)
}
numProduced := times * recipe.outQty
excess[chem] += numProduced - amt
return ret
}
func GetMaxFuelForOre(inp []string, ore int) int {
var start, guesses, lastGuess, fuelGuess int
end := ore
for {
guesses++
fuelGuess = (end-start)/2 + start
requiredOre := FindRequiredOre(inp, fuelGuess)
if requiredOre == ore {
break
}
if requiredOre > ore {
end = fuelGuess
} else {
start = fuelGuess
}
if fuelGuess == lastGuess {
break
}
lastGuess = fuelGuess
}
return fuelGuess
}
// this is too slow... Gonna re-engineer it...
func part2Slow(inp []string) {
allReactions = make(map[string]*Reaction)
for _, v := range inp {
r := NewReaction(v)

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