Step by Step solution about How to resolve the algorithm Teacup rim text step by step in the Go programming language

This Go program finds and prints word variants that are formed by cyclically rotating the letters of a word. It uses two dictionaries, mit_10000.txt and unixdict.txt, to find word variants.

The program starts by reading the words from the specified dictionary file into a slice of strings. It then iterates over the words in the slice, excluding words with less than three letters.

For each word, the program creates a slice of runes (Unicode code points) to represent the word's letters. It then creates a slice of strings to hold the variants of the word.

The program then iterates over the runes in the word's slice, rotating the runes one position to the left at each iteration. For each rotated slice of runes, the program creates a string and checks if it is equal to the original word or if it has already been added to the slice of variants. If either of these conditions is true, the program continues to the next iteration of the outer loop.

If the string is not equal to the original word and has not already been added to the slice of variants, the program uses the sort.SearchStrings function to find the index of the string in the slice of words. If the index is equal to the length of the slice or the string at that index is not equal to the rotated string, the program continues to the next iteration of the outer loop.

If the string is equal to the rotated string, the program adds it to the slice of variants and continues to the next iteration of the inner loop.

After all possible variants of the word have been found, the program prints the slice of variants.

The program repeats this process for all words in the dictionary file, and then it prints a new line to separate the results for the two dictionaries.

package main

import (
    "bufio"
    "fmt"
    "log"
    "os"
    "sort"
    "strings"
)

func check(err error) {
    if err != nil {
        log.Fatal(err)
    }
}

func readWords(fileName string) []string {
    file, err := os.Open(fileName)
    check(err)
    defer file.Close()
    var words []string
    scanner := bufio.NewScanner(file)
    for scanner.Scan() {
        word := strings.ToLower(strings.TrimSpace(scanner.Text()))
        if len(word) >= 3 {
            words = append(words, word)
        }
    }
    check(scanner.Err())
    return words
}

func rotate(runes []rune) {
    first := runes[0]
    copy(runes, runes[1:])
    runes[len(runes)-1] = first
}

func main() {
    dicts := []string{"mit_10000.txt", "unixdict.txt"} // local copies
    for _, dict := range dicts {
        fmt.Printf("Using %s:\n\n", dict)
        words := readWords(dict)
        n := len(words)
        used := make(map[string]bool)
    outer:
        for _, word := range words {
            runes := []rune(word)
            variants := []string{word}
            for i := 0; i < len(runes)-1; i++ {
                rotate(runes)
                word2 := string(runes)
                if word == word2 || used[word2] {
                    continue outer
                }
                ix := sort.SearchStrings(words, word2)
                if ix == n || words[ix] != word2 {
                    continue outer
                }
                variants = append(variants, word2)
            }
            for _, variant := range variants {
                used[variant] = true
            }
            fmt.Println(variants)
        }
        fmt.Println()
    }
}