Task: Word search




Go: package main

import (
    "bufio"
    "fmt"
    "log"
    "math/rand"
    "os"
    "regexp"
    "strings"
    "time"
)

var dirs = [][]int{{1, 0}, {0, 1}, {1, 1}, {1, -1}, {-1, 0}, {0, -1}, {-1, -1}, {-1, 1}}

const (
    nRows    = 10
    nCols    = nRows
    gridSize = nRows * nCols
    minWords = 25
)

var (
    re1 = regexp.MustCompile(fmt.Sprintf("^[a-z]{3,%d}$", nRows))
    re2 = regexp.MustCompile("[^A-Z]")
)

type grid struct {
    numAttempts int
    cells       [nRows][nCols]byte
    solutions   []string
}

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 re1.MatchString(word) {
            words = append(words, word)
        }
    }
    check(scanner.Err())
    return words
}

func createWordSearch(words []string) *grid {
    var gr *grid
outer:
    for i := 1; i < 100; i++ {
        gr = new(grid)
        messageLen := gr.placeMessage("Rosetta Code")
        target := gridSize - messageLen
        cellsFilled := 0
        rand.Shuffle(len(words), func(i, j int) {
            words[i], words[j] = words[j], words[i]
        })
        for _, word := range words {
            cellsFilled += gr.tryPlaceWord(word)
            if cellsFilled == target {
                if len(gr.solutions) >= minWords {
                    gr.numAttempts = i
                    break outer
                } else { 
                    break
                }
            }
        }
    }
    return gr
}

func (gr *grid) placeMessage(msg string) int {
    msg = strings.ToUpper(msg)
    msg = re2.ReplaceAllLiteralString(msg, "")
    messageLen := len(msg)
    if messageLen > 0 && messageLen < gridSize {
        gapSize := gridSize / messageLen
        for i := 0; i < messageLen; i++ {
            pos := i*gapSize + rand.Intn(gapSize)
            gr.cells[pos/nCols][pos%nCols] = msg[i]
        }
        return messageLen
    }
    return 0
}

func (gr *grid) tryPlaceWord(word string) int {
    randDir := rand.Intn(len(dirs))
    randPos := rand.Intn(gridSize)
    for dir := 0; dir < len(dirs); dir++ {
        dir = (dir + randDir) % len(dirs)
        for pos := 0; pos < gridSize; pos++ {
            pos = (pos + randPos) % gridSize
            lettersPlaced := gr.tryLocation(word, dir, pos)
            if lettersPlaced > 0 {
                return lettersPlaced
            }
        }
    }
    return 0
}

func (gr *grid) tryLocation(word string, dir, pos int) int {
    r := pos / nCols
    c := pos % nCols
    le := len(word)

    
    if (dirs[dir][0] == 1 && (le+c) > nCols) ||
        (dirs[dir][0] == -1 && (le-1) > c) ||
        (dirs[dir][1] == 1 && (le+r) > nRows) ||
        (dirs[dir][1] == -1 && (le-1) > r) {
        return 0
    }
    overlaps := 0

    
    rr := r
    cc := c
    for i := 0; i < le; i++ {
        if gr.cells[rr][cc] != 0 && gr.cells[rr][cc] != word[i] {
            return 0
        }
        cc += dirs[dir][0]
        rr += dirs[dir][1]
    }

    
    rr = r
    cc = c
    for i := 0; i < le; i++ {
        if gr.cells[rr][cc] == word[i] {
            overlaps++
        } else {
            gr.cells[rr][cc] = word[i]
        }
        if i < le-1 {
            cc += dirs[dir][0]
            rr += dirs[dir][1]
        }
    }

    lettersPlaced := le - overlaps
    if lettersPlaced > 0 {
        sol := fmt.Sprintf("%-10s (%d,%d)(%d,%d)", word, c, r, cc, rr)
        gr.solutions = append(gr.solutions, sol)
    }
    return lettersPlaced
}

func printResult(gr *grid) {
    if gr.numAttempts == 0 {
        fmt.Println("No grid to display")
        return
    }
    size := len(gr.solutions)
    fmt.Println("Attempts:", gr.numAttempts)
    fmt.Println("Number of words:", size)
    fmt.Println("\n     0  1  2  3  4  5  6  7  8  9")
    for r := 0; r < nRows; r++ {
        fmt.Printf("\n%d   ", r)
        for c := 0; c < nCols; c++ {
            fmt.Printf(" %c ", gr.cells[r][c])
        }
    }
    fmt.Println("\n")
    for i := 0; i < size-1; i += 2 {
        fmt.Printf("%s   %s\n", gr.solutions[i], gr.solutions[i+1])
    }
    if size%2 == 1 {
        fmt.Println(gr.solutions[size-1])
    }
}

func main() {
    rand.Seed(time.Now().UnixNano())
    unixDictPath := "/usr/share/dict/words"
    printResult(createWordSearch(readWords(unixDictPath)))
}





VB: Module Module1

    ReadOnly Dirs As Integer(,) = {
        {1, 0}, {0, 1}, {1, 1},
        {1, -1}, {-1, 0},
        {0, -1}, {-1, -1}, {-1, 1}
    }

    Const RowCount = 10
    Const ColCount = 10
    Const GridSize = RowCount * ColCount
    Const MinWords = 25

    Class Grid
        Public cells(RowCount - 1, ColCount - 1) As Char
        Public solutions As New List(Of String)
        Public numAttempts As Integer

        Sub New()
            For i = 0 To RowCount - 1
                For j = 0 To ColCount - 1
                    cells(i, j) = ControlChars.NullChar
                Next
            Next
        End Sub
    End Class

    Dim Rand As New Random()

    Sub Main()
        PrintResult(CreateWordSearch(ReadWords("unixdict.txt")))
    End Sub

    Function ReadWords(filename As String) As List(Of String)
        Dim maxlen = Math.Max(RowCount, ColCount)
        Dim words As New List(Of String)

        Dim objReader As New IO.StreamReader(filename)
        Dim line As String
        Do While objReader.Peek() <> -1
            line = objReader.ReadLine()
            If line.Length > 3 And line.Length < maxlen Then
                If line.All(Function(c) Char.IsLetter(c)) Then
                    words.Add(line)
                End If
            End If
        Loop

        Return words
    End Function

    Function CreateWordSearch(words As List(Of String)) As Grid
        For numAttempts = 1 To 1000
            Shuffle(words)

            Dim grid As New Grid()
            Dim messageLen = PlaceMessage(grid, "Rosetta Code")
            Dim target = GridSize - messageLen

            Dim cellsFilled = 0
            For Each word In words
                cellsFilled = cellsFilled + TryPlaceWord(grid, word)
                If cellsFilled = target Then
                    If grid.solutions.Count >= MinWords Then
                        grid.numAttempts = numAttempts
                        Return grid
                    Else
                        
                        Exit For
                    End If
                End If
            Next
        Next

        Return Nothing
    End Function

    Function PlaceMessage(grid As Grid, msg As String) As Integer
        msg = msg.ToUpper()
        msg = msg.Replace(" ", "")

        If msg.Length > 0 And msg.Length < GridSize Then
            Dim gapSize As Integer = GridSize / msg.Length

            Dim pos = 0
            Dim lastPos = -1
            For i = 0 To msg.Length - 1
                If i = 0 Then
                    pos = pos + Rand.Next(gapSize - 1)
                Else
                    pos = pos + Rand.Next(2, gapSize - 1)
                End If
                Dim r As Integer = Math.Floor(pos / ColCount)
                Dim c = pos Mod ColCount

                grid.cells(r, c) = msg(i)

                lastPos = pos
            Next
            Return msg.Length
        End If

        Return 0
    End Function

    Function TryPlaceWord(grid As Grid, word As String) As Integer
        Dim randDir = Rand.Next(Dirs.GetLength(0))
        Dim randPos = Rand.Next(GridSize)

        For d = 0 To Dirs.GetLength(0) - 1
            Dim dd = (d + randDir) Mod Dirs.GetLength(0)

            For p = 0 To GridSize - 1
                Dim pp = (p + randPos) Mod GridSize

                Dim lettersPLaced = TryLocation(grid, word, dd, pp)
                If lettersPLaced > 0 Then
                    Return lettersPLaced
                End If
            Next
        Next

        Return 0
    End Function

    Function TryLocation(grid As Grid, word As String, dir As Integer, pos As Integer) As Integer
        Dim r As Integer = pos / ColCount
        Dim c = pos Mod ColCount
        Dim len = word.Length

        
        If (Dirs(dir, 0) = 1 And len + c >= ColCount) Or (Dirs(dir, 0) = -1 And len - 1 > c) Or (Dirs(dir, 1) = 1 And len + r >= RowCount) Or (Dirs(dir, 1) = -1 And len - 1 > r) Then
            Return 0
        End If
        If r = RowCount OrElse c = ColCount Then
            Return 0
        End If

        Dim rr = r
        Dim cc = c

        
        For i = 0 To len - 1
            If grid.cells(rr, cc) <> ControlChars.NullChar AndAlso grid.cells(rr, cc) <> word(i) Then
                Return 0
            End If

            cc = cc + Dirs(dir, 0)
            rr = rr + Dirs(dir, 1)
        Next

        
        Dim overlaps = 0
        rr = r
        cc = c
        For i = 0 To len - 1
            If grid.cells(rr, cc) = word(i) Then
                overlaps = overlaps + 1
            Else
                grid.cells(rr, cc) = word(i)
            End If

            If i < len - 1 Then
                cc = cc + Dirs(dir, 0)
                rr = rr + Dirs(dir, 1)
            End If
        Next

        Dim lettersPlaced = len - overlaps
        If lettersPlaced > 0 Then
            grid.solutions.Add(String.Format("{0,-10} ({1},{2})({3},{4})", word, c, r, cc, rr))
        End If

        Return lettersPlaced
    End Function

    Sub PrintResult(grid As Grid)
        If IsNothing(grid) OrElse grid.numAttempts = 0 Then
            Console.WriteLine("No grid to display")
            Return
        End If

        Console.WriteLine("Attempts: {0}", grid.numAttempts)
        Console.WriteLine("Number of words: {0}", GridSize)
        Console.WriteLine()

        Console.WriteLine("     0  1  2  3  4  5  6  7  8  9")
        For r = 0 To RowCount - 1
            Console.WriteLine()
            Console.Write("{0}   ", r)
            For c = 0 To ColCount - 1
                Console.Write(" {0} ", grid.cells(r, c))
            Next
        Next

        Console.WriteLine()
        Console.WriteLine()

        For i = 0 To grid.solutions.Count - 1
            If i Mod 2 = 0 Then
                Console.Write("{0}", grid.solutions(i))
            Else
                Console.WriteLine("   {0}", grid.solutions(i))
            End If
        Next

        Console.WriteLine()
    End Sub

    
    Sub Shuffle(Of T)(list As IList(Of T))
        Dim r As Random = New Random()
        For i = 0 To list.Count - 1
            Dim index As Integer = r.Next(i, list.Count)
            If i <> index Then
                
                Dim temp As T = list(i)
                list(i) = list(index)
                list(index) = temp
            End If
        Next
    End Sub

End Module