Advent of Code (Day 6)

main.go

package main

import (
	"fmt"
	"errors"
)

func find_unique(signal string) (int, error) {
	signal_length := len(signal)
	unique_length := 4

	var check_string string

	for i := 0; i <= signal_length-unique_length; i++ {
		check_string = signal[i : i+unique_length]
		char_map := make(map[string]int)

		for _, r := range check_string {
			if _, ok := char_map[string(r)]; ok {
				char_map[string(r)]++
			} else {
				char_map[string(r)] = 1
			}
		}

		found_unique := true
		for _,count := range char_map {
			if count > 1 {
				found_unique = false
			}
		}
		
		// fmt.Printf("%v\n", found_unique)
		// fmt.Printf("%v\n", char_map)
		// fmt.Printf("%v\n", check_string)

		if found_unique {
			return i + unique_length, nil
		}
	}

	return -1, errors.New("No unique found")
}

// https://adventofcode.com/2022/day/6
func main() {
	signals := []string{
		"bvwbjplbgvbhsrlpgdmjqwftvncz", 
		"nppdvjthqldpwncqszvftbrmjlhg", 
		"nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg", 
		"zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw", 
		"gregregregregregregregregregreg",
	}

	for _, signal := range signals {
		found, err := find_unique(signal)
		if err != nil {
			fmt.Printf("No unique found in: %v\n", signal)
		} else {
			fmt.Printf("Unique found at: %v\n", found)
		}
	}
}