84 lines
1.4 KiB
Go
84 lines
1.4 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"log"
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"os"
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"strconv"
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"strings"
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)
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func partOne() int {
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file, err := os.Open("input.txt")
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if err != nil {
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log.Fatalf("failed to open file: %s", err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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tot := 0
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for scanner.Scan() {
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line := scanner.Text()
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splitLine := strings.Split(line, "")
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biggest := -1
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for i, n := range splitLine {
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for _, x := range splitLine[(i + 1):] {
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num, _ := strconv.Atoi((n + x))
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if num > biggest {
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biggest = num
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}
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}
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}
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tot += biggest
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}
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return tot
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}
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func findBiggest(nums []int, minLen int, start int) int {
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nums = nums[start:]
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max := 0
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for i, n := range nums {
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if len(nums)-(i+1) < minLen {
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break
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}
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if n > nums[max] {
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max = i
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}
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}
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return max + start
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}
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func partTwo() int {
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file, err := os.Open("input.txt")
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if err != nil {
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log.Fatalf("failed to open file: %s", err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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tot := 0
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for scanner.Scan() {
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line := scanner.Text()
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splitLine := strings.Split(line, "")
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nums := []int{}
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for _, s := range splitLine {
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i, _ := strconv.Atoi(s)
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nums = append(nums, i)
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}
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joltage := ""
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min := 0
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for i := 11; i >= 0; i-- {
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newBiggest := findBiggest(nums, i, min)
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joltage += strconv.Itoa(nums[newBiggest])
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min = newBiggest + 1
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}
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joltageInt, _ := strconv.Atoi(joltage)
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tot += joltageInt
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}
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return tot
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}
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func main() {
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fmt.Println(partOne())
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fmt.Println(partTwo())
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}
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