109 lines
1.9 KiB
Go
109 lines
1.9 KiB
Go
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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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)
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const (
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locChecksum = iota
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locSector
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locName
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)
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func main() {
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input := stdinToStringSlice()
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var sectorTotal int
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for _, h := range input {
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var chksum, sector, name string
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var loc int
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freq := make(map[rune]int)
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for i := len(h) - 1; i >= 0; i-- {
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switch h[i] {
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case ']': // start reading checksum
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loc = locChecksum
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case '[': // start reading sector
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loc = locSector
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case '-':
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if loc == locSector { // done with sector
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loc = locName
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}
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default:
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switch loc {
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case locChecksum:
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chksum = string(h[i]) + chksum
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case locSector:
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sector = string(h[i]) + sector
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case locName:
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name = string(h[i]) + name
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freq[rune(h[i])]++
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}
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}
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}
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fmt.Println(decryptName(name, atoi(sector)), " :: ", sector)
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var top rune
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var realChecksum string
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for i := 0; i < 5; i++ {
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top, freq = findTop(freq)
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realChecksum = realChecksum + string(top)
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}
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if realChecksum == chksum {
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sectorTotal += atoi(sector)
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}
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}
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fmt.Println("Sector Total: " + itoa(sectorTotal))
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}
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func decryptName(name string, rot int) string {
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var decName string
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for _, v := range name {
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for k := 0; k < rot; k++ {
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v++
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if v == ('z' + 1) {
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v = 'a'
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}
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}
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decName = decName + string(v)
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}
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return decName
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}
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func findTop(inp map[rune]int) (rune, map[rune]int) {
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var topCnt int
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var topVal rune
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for k, v := range inp {
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if v > topCnt || (v == topCnt && k < topVal) {
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topCnt = v
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topVal = k
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}
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}
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delete(inp, topVal)
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return topVal, inp
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}
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func stdinToStringSlice() []string {
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var input []string
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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input = append(input, scanner.Text())
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}
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return input
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}
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func itoa(i int) string {
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return strconv.Itoa(i)
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}
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func atoi(i string) int {
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var ret int
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var err error
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if ret, err = strconv.Atoi(i); err != nil {
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log.Fatal("Invalid Atoi")
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}
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return ret
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}
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