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main.go
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main.go
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package main
import (
"bufio"
"flag"
"fmt"
"log"
"math/rand"
"os"
"strings"
"time"
"github.com/eliben/go-sudoku"
)
var statsFlag = flag.Bool("stats", false, "enable stats for solving")
var randomizeFlag = flag.Bool("randomize", false, "randomize solving order")
var actionFlag = flag.String("action", "solve", "action to perform: solve, count")
func main() {
flag.Usage = func() {
out := flag.CommandLine.Output()
fmt.Fprintln(out, "usage: solver [options] <input in stdin>")
fmt.Fprintln(out, "Options:")
flag.PrintDefaults()
}
flag.Parse()
switch *actionFlag {
case "solve":
solveAndReport()
case "count":
countHints()
default:
flag.Usage()
log.Fatal("Please select one of the supported actions.")
}
}
func solveAndReport() {
var totalDuration time.Duration = 0
var maxDuration time.Duration = 0
var totalSearches uint64 = 0
var totalDifficulty float64
var maxSearches uint64 = 0
var numBoards int = 0
var numSolved int = 0
if *statsFlag {
sudoku.EnableStats = true
}
if *randomizeFlag {
rand.Seed(time.Now().UnixNano())
}
boards := getInputBoards()
for _, board := range boards {
numBoards++
v, err := sudoku.ParseBoard(board, false)
if err != nil {
log.Fatal(err)
}
d, err := sudoku.EvaluateDifficulty(v)
if err != nil {
log.Fatal(err)
}
totalDifficulty += d
tStart := time.Now()
sudoku.EliminateAll(v)
v, _ = sudoku.Solve(v, sudoku.SolveOptions{Randomize: *randomizeFlag})
if err != nil {
log.Fatal(err)
}
tElapsed := time.Now().Sub(tStart)
totalDuration += tElapsed
if tElapsed > maxDuration {
maxDuration = tElapsed
}
if sudoku.IsSolved(v) {
numSolved++
}
if *statsFlag {
totalSearches += sudoku.Stats.NumSearches
if sudoku.Stats.NumSearches > maxSearches {
maxSearches = sudoku.Stats.NumSearches
}
sudoku.Stats.Reset()
}
}
fmt.Printf("Solved %v/%v boards\n", numSolved, numBoards)
fmt.Printf("Average difficulty: %.2v\n", totalDifficulty/float64(numBoards))
fmt.Printf("Duration average=%-15v max=%v\n", totalDuration/time.Duration(numBoards), maxDuration)
if *statsFlag {
fmt.Printf("Searches average=%-15.2f max=%v\n", float64(totalSearches)/float64(numBoards), maxSearches)
}
}
func countHints() {
boards := getInputBoards()
for _, board := range boards {
fmt.Println("board:", board)
v, err := sudoku.ParseBoard(board, false)
if err != nil {
log.Fatal(err)
}
fmt.Println("|")
initialNumHints := sudoku.CountHints(v)
fmt.Printf("\\ initial num hints: %v\n", initialNumHints)
sudoku.EliminateAll(v)
afterElimNumHints := sudoku.CountHints(v)
fmt.Printf(" num hints after elimination: %v\n", afterElimNumHints)
sudoku.ApplyTwinsStrategy(v)
afterTwinsNumHints := sudoku.CountHints(v)
fmt.Printf(" num hints after twins: %v\n", afterTwinsNumHints)
fmt.Println("")
}
}
// getInputBoards reads input boards from stdin, ignores comments and empty
// lines and returns them.
func getInputBoards() []string {
var boards []string
scanner := bufio.NewScanner(os.Stdin)
// Expect one board per line, ignoring whitespace and lines starting with '#'.
for scanner.Scan() {
board := strings.TrimSpace(scanner.Text())
if len(board) == 0 || strings.HasPrefix(board, "#") {
continue
}
boards = append(boards, board)
}
if err := scanner.Err(); err != nil {
log.Fatal(err)
}
return boards
}