搜索--数独_normal sudoku rules apply. consider the first x ce-优快云博客

本文链接：https://blog.youkuaiyun.com/a1046765624/article/details/76472906

本文介绍了一种解决数独游戏的算法实现，通过深度优先搜索（DFS）策略填充空白格，确保每行、每列及每个宫格内的数字1至9不重复。代码采用C++编写，并附带示例输入输出。

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Sudoku

Time Limit : 4000/2000ms (Java/Other) Memory Limit : 131072/65536K (Java/Other)

Total Submission(s) : 7 Accepted Submission(s) : 6

Special Judge

Problem Description

Sudoku is a very simple task. A square table with 9 rows and 9 columns is divided to 9 smaller squares 3x3 as shown on the Figure. In some of the cells are written decimal digits from 1 to 9. The other cells are empty. The goal is to fill the empty cells with decimal digits from 1 to 9, one digit per cell, in such way that in each row, in each column and in each marked 3x3 subsquare, all the digits from 1 to 9 to appear. Write a program to solve a given Sudoku-task.

Input

The input data will start with the number of the test cases. For each test case, 9 lines follow, corresponding to the rows of the table. On each line a string of exactly 9 decimal digits is given, corresponding to the cells in this line. If a cell is empty it is represented by 0.

Output

For each test case your program should print the solution in the same format as the input data. The empty cells have to be filled according to the rules. If solutions is not unique, then the program may print any one of them.

Sample Input

Sample Output

143628579
572139468
986754231
391542786
468917352
725863914
237481695
619275843
854396127
题目大概：
小时候我们玩的数独游戏，把为零的数填上，横竖都只有一遍1到9，在九宫格内也是。
思路：
用dfs搜索，一个空一个空的填，注意判断能够填上的条件又是那个，横，竖，九宫格。
代码：
#include <iostream>
#include <string>
using namespace std;
int a[10][10];
int f=0;

int che(int x,int y,int k)
{for(int i=1;i<=9;i++)
{
    if(a[x][i]==k)return 0;

}
for(int i=1;i<=9;i++)
{
    if(a[i][y]==k)return 0;

}
for(int i=(x-1)/3*3+1;i<=(x-1)/3*3+3;i++)
{
    for(int j=(y-1)/3*3+1;j<=(y-1)/3*3+3;j++)
    {
        if(a[i][j]==k)return 0;

    }
}
  return 1;
}
int print()
{
for(int i=1;i<=9;i++)
{
    for(int j=1;j<=9;j++)
    {
        cout<<a[i][j];

    }
    cout<<endl;
}
return 0;
}


int dfs(int x,int y)
{  if(x==10&&y==1){print();
   f=1;}

  if(f)return 0;

    if(a[x][y]!=0){if(y==9)dfs(x+1,1);
    else dfs(x,y+1);}
    else {
        for(int i=1;i<=9;i++)
    {
        if(che(x,y,i)){  a[x][y]=i;if(y==9)dfs(x+1,1);
    else dfs(x,y+1);if(f)return 0;a[x][y]=0;}
    }

    }
    return 0;
}

int main()
{int t;
cin>>t;
for(int i=1;i<=t;i++)
{string s;
f=0;
for(int j=1;j<=9;j++)
{
    cin>>s;
    for(int k=0;k<9;k++)
    {
        a[j][k+1]=s[k]-48;
    }
}


dfs(1,1);

}


    return 0;
}