我是c++的初学者::您可以从我的代码中了解这一点::需要帮助才能在c++中创建Sudoku求解器
该计划的要求:
我的计划:
并为每个空白集分配1-9的可能性。并进行暴力
解决难题的方法。每次都会调用函数验证
同时做蛮力。它消耗很多时间，我知道这是
不可能。
我需要用于求解功能的更好算法，请帮助我:
我已经评论了一些代码只是为了分析代码:如果这是错误的方法，请道歉。我只是一个初学者。上个月开始编码c++。我在网上看到了一些有关数独解决方案的代码，但是我很难分析它们。
到目前为止，这是我所做的:
/* Program: To solve a SU-DO-KU:
Date:23-sep-2013 @ 5.30:
*/
#include<iostream>
using namespace std;
int su_in[9][9]={
0,0,7 ,0,0,0 ,4,0,6,
8,0,0 ,4,0,0 ,1,7,0,
0,0,0 ,3,0,0 ,9,0,5,
0,0,0 ,7,0,5 ,0,0,8,
0,0,0 ,0,0,0 ,0,0,0,
4,0,0 ,2,0,8 ,0,0,0,
7,0,4 ,0,0,3 ,0,0,0,
0,5,2 ,0,0,1 ,0,0,9,
1,0,8 ,0,0,0 ,6,0,0
};
int su_out[9][9];/*={
5,3,7 ,9,1,2 ,4,8,6,
8,2,9 ,4,5,6 ,1,7,3,
6,4,1 ,3,8,7 ,9,2,5,
9,1,3 ,7,4,5 ,2,6,8,
2,8,6 ,1,3,9 ,7,5,4,
4,7,5 ,2,6,8 ,3,9,1,
7,6,4 ,8,9,3 ,5,1,2,
3,5,2 ,6,7,1 ,8,4,9,
1,9,8 ,5,2,4 ,6,3,7
};*/
struct chance{
int poss[9];
};
int box_validate(int,int,int);
void read(int);
void display(int);
int validate(int);
int solve();
int main()
{
int i,j,row,get_res=2;
enum {input=1,output};
cout<<"enter the sudoku: use 0 if the colum is empty:\n";
// for(i=0; i<9; i++){
// read(i);
// }
cout<<"\n\t\tTHE ENTERED SU-DO-CU IS:\n\n";
display(input);
get_res=validate(input);
if(get_res==0)
cout<<"valid input!\n";
else if(get_res==1)
cout<<"invalid input!\n";
// display(input);
for(i=0; i<9; i++)
for(j=0; j<9; j++)
su_out[i][j]=su_in[i][j];
// display(output);
get_res=validate(output);
if(get_res==0){
cout<<"valid solution!\n"; display(output);}
// else if(get_res==1)
// cout<<"invalid sudoku!\n";
if(solve()==0) display(output);
else cout<<"not solved buddy!!\n";
}
void read(int row) // function to read the SU-DO-CU
{
unsigned num,i;
cout<<"enter the row:'"<<row+1<<"'\n";
for(i=0; i<9; i++)
{
cin>>num;
if(num<0||num>9)
cout<<"error! invalid input: enter a number < or = 9 and > or = 0 \n";
else
su_in[row][i]=num;
}
}
void display(int sudoku) // function to display the SU-DO-CU
{
unsigned i,j;
for(i=0;i<9; i++)
{
if(i%3==0)
cout<<"\t\t-------------------------\n";
cout<<"\t\t";
for(j=0; j<9; j++)
{
if(j%3==0)
cout<<"| ";
// if(su[i][j]==0)
// cout<<"_ ";
// else
if(sudoku==1)
cout<<su_in[i][j]<<" ";
else if(sudoku==2)
cout<<su_out[i][j]<<" ";
if(j==8)
cout<<"|";
}
cout<<"\n";
if(i==8)
cout<<"\t\t-------------------------\n";
}
}
int validate(int sudoku) // function to validate the input SU-DO-CU
{
unsigned i,j,k,n,count=0;
//..........................row validation
for(i=0; i<9; i++)
for(j=0; j<9; j++)
for(k=0;k<9;k++)
{
if(sudoku==1 && k!=j && su_in[i][j]!=0)
{
if(su_in[i][j]==su_in[i][k])
return 1;
}
else if(sudoku==2 && k!=j )
{
if(su_out[i][j]==su_out[i][k])
return 1;
}
}
//..................................colume validation
for(i=0; i<9; i++)
for(j=0; j<9; j++)
for(k=0; k<9; k++)
{
if(sudoku==1 && k!=j && su_in[j][i]!=0)
{
if(su_in[j][i]==su_in[k][i])
return 1;
}
else if(sudoku==2 && k!=i )
{
if(su_out[j][i]==su_out[j][k])
return 1;
}
}
// each box validating.......................
for(i=0; i<=6; i=i+3)
for(j=0; j<=6; j=j+3)
{
if(box_validate(i,j,sudoku)==1)
return 1;
}
// sum validation for output....
if(sudoku==2)
{
for(i=0; i<9; i++)
for(j=0; j<9; j++)
count=count+su_out[i][j];
if(count!=405) return 1;
}
return 0;
}
int box_validate(int i,int j,int sudoku)
{
unsigned k=j,n=i;
int temp_i=i,temp_j=j,temp_k=k, temp_n=n;
for(i=temp_i; i<temp_i+3; i++)
for(j=temp_j; j<temp_j+3; j++)
for(k=temp_k; k<temp_k+3; k++)
{
if(sudoku==1 && k!=j && su_in[i][j]!=0)
{
if(su_in[i][j]==su_in[i][k])
return 1;
for(n=temp_n; n<temp_n+3; n++)
{
if(sudoku==1 && su_in[i][j]!=0)
if(k==j && n==i)
;else
if(su_in[i][j]==su_in[n][k])
return 1;
}
}
if(sudoku==2 && k!=j )
{
if(su_out[i][j]==su_out[i][k])
return 1;
for(n=temp_n; n<temp_n+3; n++)
{
if(sudoku==1 )
if(k==j && n==i)
;else
if(su_out[i][j]==su_out[n][k])
return 1;
}
}
}
return 0;
}
int solve()
{
unsigned i,j,k,m,n,x;
struct chance cell[9][9];
for(i=0; i<9; i++)
for(j=0; j<9; j++)
if(su_in[i][j]==0)
for(k=0;k<9; k++)
cell[i][j].poss[k]=k+1;
/*
for(i=0; i<9; i++)
for(j=0; j<9; j++)
if(su_in[i][j]==0)
for(k=0;k<9; k++)
{ su_out[i][j]=cell[i][j].poss[k]=k+1;
su_out[i][j]=cell[i][j].poss[k];
for(m=0; m<9; m++)
for(n=0; n<9; n++)
for(x=1; x<=9; x++)
{ if(x!=k+1)
cell[m][n].poss[x]==x;
if(validate(2)==0)
return 0;
}
}*/
for(i=0; i<9; i++)
for(j=0; j<9; j++)
if(su_in[i][j]==0)
while (validate(2)==0)
{
for(k=0;k<9; k++)
{ su_out[i][j]=k+1;
for(m=i+1; m <9 ; m++)
for(n=0; n <9 ; n++)
for(x=1; x<=9; x++)
{ su_out[m][n]=x;
if(validate(2)==0)
return 0;
}
}
}
}
最佳答案
#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
using namespace std;
#define UNASSIGNED 0
#define N 9
bool FindUnassignedLocation(int grid[N][N], int &row, int &col);
bool isSafe(int grid[N][N], int row, int col, int num);
/* assign values to all unassigned locations for Sudoku solution
*/
bool SolveSudoku(int grid[N][N])
{
int row, col;
if (!FindUnassignedLocation(grid, row, col))
return true;
for (int num = 1; num <= 9; num++)
{
if (isSafe(grid, row, col, num))
{
grid[row][col] = num;
if (SolveSudoku(grid))
return true;
grid[row][col] = UNASSIGNED;
}
}
return false;
}
/* Searches the grid to find an entry that is still unassigned. */
bool FindUnassignedLocation(int grid[N][N], int &row, int &col)
{
for (row = 0; row < N; row++)
for (col = 0; col < N; col++)
if (grid[row][col] == UNASSIGNED)
return true;
return false;
}
/* Returns whether any assigned entry n the specified row matches
the given number. */
bool UsedInRow(int grid[N][N], int row, int num)
{
for (int col = 0; col < N; col++)
if (grid[row][col] == num)
return true;
return false;
}
/* Returns whether any assigned entry in the specified column matches
the given number. */
bool UsedInCol(int grid[N][N], int col, int num)
{
for (int row = 0; row < N; row++)
if (grid[row][col] == num)
return true;
return false;
}
/* Returns whether any assigned entry within the specified 3x3 box matches
the given number. */
bool UsedInBox(int grid[N][N], int boxStartRow, int boxStartCol, int num)
{
for (int row = 0; row < 3; row++)
for (int col = 0; col < 3; col++)
if (grid[row+boxStartRow][col+boxStartCol] == num)
return true;
return false;
}
/* Returns whether it will be legal to assign num to the given row,col location.
*/
bool isSafe(int grid[N][N], int row, int col, int num)
{
return !UsedInRow(grid, row, num) && !UsedInCol(grid, col, num) &&
!UsedInBox(grid, row - row % 3 , col - col % 3, num);
}
void printGrid(int grid[N][N])
{
for (int row = 0; row < N; row++)
{
for (int col = 0; col < N; col++)
cout<<grid[row][col]<<" ";
cout<<endl;
}
}
int main()
{
int grid[N][N] = {{3, 0, 6, 5, 0, 8, 4, 0, 0},
{5, 2, 0, 0, 0, 0, 0, 0, 0},
{0, 8, 7, 0, 0, 0, 0, 3, 1},
{0, 0, 3, 0, 1, 0, 0, 8, 0},
{9, 0, 0, 8, 6, 3, 0, 0, 5},
{0, 5, 0, 0, 9, 0, 6, 0, 0},
{1, 3, 0, 0, 0, 0, 2, 5, 0},
{0, 0, 0, 0, 0, 0, 0, 7, 4},
{0, 0, 5, 2, 0, 6, 3, 0, 0}};
if (SolveSudoku(grid) == true)
printGrid(grid);
else
cout<<"No solution exists"<<endl;
return 0;
}
关于c++ - C++中的SUDOKU求解器，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19022739/