61 lines
1.1 KiB
Go
61 lines
1.1 KiB
Go
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
)
|
||
|
|
|
||
|
|
// https://adventofcode.com/2024/day/2
|
||
|
|
// 7 6 4 2 1
|
||
|
|
// 1 2 7 8 9
|
||
|
|
// 9 7 6 2 1
|
||
|
|
// 1 3 2 4 5
|
||
|
|
// 8 6 4 4 1
|
||
|
|
// 1 3 6 7 9
|
||
|
|
var reports = [][]int{{7,6,4,2,1},
|
||
|
|
{1,2,7,8,9},
|
||
|
|
{9,7,6,2,1},
|
||
|
|
{1,3,2,4,5},
|
||
|
|
{8,6,4,4,1},
|
||
|
|
{1,3,6,7,9}}
|
||
|
|
|
||
|
|
func abs(num int) int {
|
||
|
|
if (num < 0) {
|
||
|
|
return -num
|
||
|
|
} else {
|
||
|
|
return num
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// lvl == level
|
||
|
|
func compareLevels(report []int) (bool) {
|
||
|
|
var isReportSafe bool = false
|
||
|
|
var incrOrDecr bool = report[1] > report[0] // incr: true | decr: false
|
||
|
|
for i := 0; i < len(report)-1; i++ {
|
||
|
|
var lvlDifference int = abs(report[i]-report[i+1])
|
||
|
|
|
||
|
|
if lvlDifference > 3 || lvlDifference == 0 {
|
||
|
|
return false
|
||
|
|
} else if incrOrDecr != (report[i+1] > report[i]) {
|
||
|
|
return false
|
||
|
|
} else {
|
||
|
|
isReportSafe = true
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return isReportSafe
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
var safeReportCount int
|
||
|
|
|
||
|
|
for _, report := range reports {
|
||
|
|
isReportSafe := compareLevels(report)
|
||
|
|
if isReportSafe {
|
||
|
|
safeReportCount++
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fmt.Printf("List of reports: %v\n", reports)
|
||
|
|
fmt.Printf("Number of safe reports: %v\n", safeReportCount)
|
||
|
|
}
|