commit 14dff7dffa7a4c3dcdb229fee3713ae201754352 parent 556377afe92d6c618cd6bc911b022fa7306210ef Author: Shimmy Xu <shimmy.xu@shimmy1996.com> Date: Wed, 2 Dec 2020 19:40:35 -0600 Add 2020 day 02 Diffstat:
| A | 2020/day02/input.txt | | | 1000 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2020/day02/main.go | | | 54 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 1054 insertions(+), 0 deletions(-)
diff --git a/2020/day02/input.txt b/2020/day02/input.txt
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diff --git a/2020/day02/main.go b/2020/day02/main.go
@@ -0,0 +1,54 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "os"
+ "regexp"
+ "strconv"
+ "strings"
+)
+
+func readInput(filename string) (res []string) {
+ file, _ := os.Open(filename)
+ defer file.Close()
+ scanner := bufio.NewScanner(file)
+ for scanner.Scan() {
+ res = append(res, scanner.Text())
+ }
+ return
+}
+
+func main() {
+ input := readInput("./input.txt")
+ fmt.Println(part1(input))
+ fmt.Println(part2(input))
+}
+
+func part1(input []string) (valid_count int) {
+ matcher := regexp.MustCompile(`(\d+)-(\d+) ([a-z]): ([a-z]+)`)
+ for _, line := range input {
+ matches := matcher.FindStringSubmatch(line)
+ count_low, _ := strconv.Atoi(matches[1])
+ count_high, _ := strconv.Atoi(matches[2])
+ count := strings.Count(matches[4], matches[3])
+ if count >= count_low && count <= count_high {
+ valid_count += 1
+ }
+ }
+ return
+}
+
+func part2(input []string) (valid_count int) {
+ matcher := regexp.MustCompile(`(\d+)-(\d+) ([a-z]): ([a-z]+)`)
+ for _, line := range input {
+ matches := matcher.FindStringSubmatch(line)
+ idx_low, _ := strconv.Atoi(matches[1])
+ idx_high, _ := strconv.Atoi(matches[2])
+ if (matches[4][idx_low-1] == matches[3][0]) !=
+ (matches[4][idx_high-1] == matches[3][0]) {
+ valid_count += 1
+ }
+ }
+ return
+}