commit 3cdbcdda987ed64482f1b63aa3463ac4c1c006c6 parent ced5160b78398f6857895b70adaa6d5ec90ee536 Author: Shimmy Xu <shimmy.xu@shimmy1996.com> Date: Fri, 18 Dec 2020 18:59:08 -0600 Add 2020 day 18 Diffstat:
| A | 2020/day18/input.txt | | | 383 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2020/day18/main.go | | | 101 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 484 insertions(+), 0 deletions(-)
diff --git a/2020/day18/input.txt b/2020/day18/input.txt
@@ -0,0 +1,383 @@
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+3 + (6 * 9 * (4 * 4) * (7 + 2 + 9 * 3 + 5 + 8)) + (3 * (6 + 7 * 4 + 9 * 8) + 3 * 5 + 9 * (5 + 9))
+(3 + (3 + 3 * 6) * 4) * 5
diff --git a/2020/day18/main.go b/2020/day18/main.go
@@ -0,0 +1,101 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "os"
+)
+
+const (
+ PAREN_L = '(' - '0'
+ PAREN_R = ')' - '0'
+ PLUS = '+' - '0'
+ MULT = '*' - '0'
+)
+
+func readInput(filename string) (res [][]int) {
+ file, _ := os.Open(filename)
+ defer file.Close()
+
+ scanner := bufio.NewScanner(file)
+ res = [][]int{}
+ for scanner.Scan() {
+ line := []int{}
+ for _, ch := range scanner.Text() {
+ if ch != ' ' {
+ line = append(line, int(ch-'0'))
+ }
+ }
+ res = append(res, line)
+ }
+ return
+}
+
+func main() {
+ input := readInput("./input.txt")
+ // 280014646144
+ fmt.Println(part1(input))
+ // 9966990988262
+ fmt.Println(part2(input))
+}
+
+func infixToPostfix(tokens []int, priority map[int]int) (res []int) {
+ ops := []int{}
+ for _, token := range tokens {
+ switch token {
+ case PAREN_L:
+ ops = append(ops, PAREN_L)
+ case PAREN_R:
+ for len(ops) > 0 && ops[len(ops)-1] != PAREN_L {
+ res, ops = append(res, ops[len(ops)-1]), ops[:len(ops)-1]
+ }
+ ops = ops[:len(ops)-1] // Remove PAREN_L
+ case PLUS, MULT:
+ for len(ops) > 0 &&
+ ops[len(ops)-1] != PAREN_L &&
+ priority[ops[len(ops)-1]] >= priority[token] {
+ res, ops = append(res, ops[len(ops)-1]), ops[:len(ops)-1]
+ }
+ ops = append(ops, token)
+ default:
+ res = append(res, token)
+ }
+ }
+ for len(ops) > 0 {
+ res, ops = append(res, ops[len(ops)-1]), ops[:len(ops)-1]
+ }
+ return
+}
+
+func calcPostfix(tokens []int) int64 {
+ vals := []int64{}
+ for _, token := range tokens {
+ switch token {
+ case PLUS:
+ vals[len(vals)-2] += vals[len(vals)-1]
+ vals = vals[:len(vals)-1]
+ case MULT:
+ vals[len(vals)-2] *= vals[len(vals)-1]
+ vals = vals[:len(vals)-1]
+ default:
+ vals = append(vals, int64(token))
+ }
+ }
+ return vals[0]
+}
+
+func part1(input [][]int) (sum int64) {
+ priority := map[int]int{}
+ for _, tokens := range input {
+ sum += calcPostfix(infixToPostfix(tokens, priority))
+ }
+ return
+}
+
+func part2(input [][]int) (sum int64) {
+ priority := map[int]int{PLUS: 1}
+ for _, tokens := range input {
+ sum += calcPostfix(infixToPostfix(tokens, priority))
+ }
+ return
+}