[代码存放于我的github上] (https://github.com/Bin-DuS/jiuyinzhenjing/tree/master/0002_gosrc/gopl_learn/037_go_demo_example/)
example.go
```
package main
import (
"./sudoku"
)
func main() {
//var smap sudoku.Sudomap
//smap = make([]byte,9)
//for i:= 0; i<len(smap);i++{
// smap[i] = make (byte,9)
//}
smap := sudoku.Sudomap{
{5, 3, 0, 0, 7, 0, 0, 0, 0},
{6, 0, 0, 1, 9, 5, 0, 0, 0},
{0, 9, 8, 0, 0, 0, 0, 6, 0},
{8, 0, 0, 0, 6, 0, 0, 0, 3},
{4, 0, 0, 8, 0, 3, 0, 0, 1},
{7, 0, 0, 0, 2, 0, 0, 0, 6},
{0, 6, 0, 0, 0, 0, 2, 8, 0},
{0, 0, 0, 4, 1, 9, 0, 0, 5},
{0, 0, 0, 0, 8, 0, 0, 7, 9},
}
smap.SolveSudoku()
}
sudoku/sudoku.go
```
package sudoku
import (
"fmt"
)
type Sudomap [][]byte
var CanChoose []map[byte]byte // 0-8 行 9-17 列 18-26 块 可填值的map
var count = 0
func (smap *Sudomap) Print() {
for _, line := range *smap {
for _, v := range line {
fmt.Printf("%d ", v)
}
fmt.Println()
}
}
func PrintChoose() {
i := 0
for _, v := range CanChoose {
fmt.Println(i, v)
i++
}
}
/*
统计空缺的个数
*/
func (smap *Sudomap) countZero() {
for _, line := range *smap {
for _, v := range line {
if v == 0 { // 值为0时表示可填
count++
}
}
}
}
func makemap() (m map[byte]byte) {
var i byte
m = make(map[byte]byte)
for i = 1; i <= 9; i++ {
m[i] = i
}
return
}
// 初始化可以填的数的列表，为map[int]int的数组
func (smap *Sudomap) initCanChoose() {
// 数组初始化时是27个map 每个map中的键值为1-9
for i := 0; i < 27; i++ {
CanChoose = append(CanChoose, makemap())
}
// 根据传进来的数独数据进行删除可以填写的map表
for i := 0; i < 9; i++ {
for j := 0; j < 9; j++ {
if c := (*smap)[i][j]; c != 0 {
//fmt.Println(c,i,j)
delete(CanChoose[i], c) // 第i行
delete(CanChoose[j+9], c) // 第j列
delete(CanChoose[j/3+i/3*3+18], c) // 第？块
//PrintChoose()
}
}
}
}
/*
判断是否可以填写，根据行，列，块map确定唯一可以填写的值
*/
func (smap *Sudomap) isCanChoose(i, j int) (byte, bool) {
flag := 0
var p byte
var ok bool
for _, v := range CanChoose[i] {
p, ok = CanChoose[j+9][v]
if ok != true {
continue
}
p, ok = CanChoose[j/3+i/3*3+18][v]
if ok != true {
continue
}
flag++
}
if flag == 1 {
//fmt.Println("isCanChoose ",p)
return p, true
} else {
return p, false
}
}
/*
进行填值操作
*/
func (smap *Sudomap) do() {
for i := 0; i < 9; i++ {
for j := 0; j < 9; j++ {
if c := (*smap)[i][j]; c == 0 {
v, ok := smap.isCanChoose(i, j)
if ok != true || v == 0 {
continue
}
count--
delete(CanChoose[i], v) // 第i行
delete(CanChoose[j+9], v) // 第j列
delete(CanChoose[j/3+i/3*3+18], v) // 第？块
(*smap)[i][j] = v
fmt.Println("我认为：（", i+1, "行", j+1, "列）为", v)
}
}
}
}
/*
主入口
*/
func (smap *Sudomap) SolveSudoku() {
smap.countZero()
//fmt.Println(count)
//smap.Print()
smap.initCanChoose()
//PrintChoose()
for count > 0 {
smap.do()
}
//smap.Print()
}
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