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day01.go
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day01.go
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package main
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
)
func day1a(input io.Reader) int {
s := bufio.NewScanner(input)
var prev, count int
for s.Scan() {
num, err := strconv.Atoi(s.Text())
if err != nil {
panic(err)
}
if prev != 0 && num > prev {
count++
}
prev = num
}
if err := s.Err(); err != nil {
panic(err)
}
return count
}
func Day1a() {
f, err := os.Open("input/day01.txt")
if err != nil {
panic(err)
}
defer f.Close()
count := day1a(f)
fmt.Printf("day 1a: %d\n", count)
}
func day1b(input io.Reader) int {
s := bufio.NewScanner(input)
var count int
var win []int
for s.Scan() {
num, err := strconv.Atoi(s.Text())
if err != nil {
panic(err)
}
win = append(win, num)
if len(win) < 4 {
continue
}
if sum(win[1:4]) > sum(win[0:3]) {
count++
}
win = win[1:4]
}
if err := s.Err(); err != nil {
panic(err)
}
return count
}
func Day1b() {
f, err := os.Open("input/day01.txt")
if err != nil {
panic(err)
}
defer f.Close()
count := day1b(f)
fmt.Printf("day 1b: %d\n", count)
}