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150 lines
2.5 KiB
150 lines
2.5 KiB
#include<stdio.h>
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#include<stdlib.h>
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#include<time.h>
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int a[10][10];
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int e,f,g;
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void input()
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{
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for(int i=1;i<10;i++)
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for(int j=1;j<10;j++)
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scanf("%d",&a[i][j]);
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}
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void random()
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{
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for(int i=1;i<10;i++)
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for(int j=1;j<10;j++)
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a[i][j]=rand()%10;
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}
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void format(int s[][10])
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{
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printf("-------------------------\n");
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for(int i=1;i<10;i++)
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{
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printf("| ");
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for(int j=1;j<10;j++)
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{
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printf("%d ",s[i][j]);
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if(j%3==0) printf("| ");
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}
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printf("\n");
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if(i%3==0) printf("-------------------------\n");
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}
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}
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bool ok(int x,int y,int s[][10])
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{
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int b=s[x][y];
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int a1=x,a2=y;
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for(int j=1;j<=9;j++)
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{
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if(j==y) continue;
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if(s[x][j]==b)
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{
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e=0;f=x;g=b;
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return false;
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}
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}
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for(int i=1;i<=9;i++)
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{
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if(i==x) continue;
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if(s[i][y]==b)
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{
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e=1;f=y;g=b;
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return false;
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}
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}
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x=(x-1)/3*3;
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y=(y-1)/3*3;
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int block;
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if(x+1==1)
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{
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if(y+1==1) block=1;
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else if(y+1==4) block=2;
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else if(y+1==7) block=3;
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}
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else if(x+1==4)
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{
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if(y+1==1) block=4;
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else if(y+1==4) block=5;
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else if(y+1==7) block=6;
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}
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else if(x+1==7)
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{
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if(y+1==1) block=7;
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else if(y+1==4) block=8;
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else if(y+1==7) block=9;
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}
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for(int i=x+1;i<x+4;i++)
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{
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for(int j=y+1;j<y+4;j++)
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{
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if(a1==i&&a2==j) continue;
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if(s[i][j]==b)
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{
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e=2;f=block;g=b;
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return false;
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}
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}
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}
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return true;
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}
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void dfs(int x,int y,int s[][10])
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{
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int c=0;
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if(x==10&&y==1)
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{
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printf("The solution of Sudoku matrix:\n");
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format(s);
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return;
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}
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if(y==10)dfs(x+1,1,s);
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else
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{
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if(s[x][y]) dfs(x,y+1,s);
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else
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{
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for(int i=1;i<=9;i++)
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{
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s[x][y]=i;
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if(ok(x,y,s))
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{
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c=1;
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dfs(x,y+1,s);
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s[x][y]=0;
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}
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}
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s[x][y]=0;
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}
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}
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}
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int main()
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{
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int d=1;
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srand(time(NULL));
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//random();
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input();
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printf("The original Sudoku matrix:\n");
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format(a);
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for(int i=1;i<=9;i++)
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for(int j=1;j<=9;j++)
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{
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if(a[i][j])
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{
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if(!ok(i,j,a))
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{
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printf("False:Invalid initial Sudoku matrix!\n");
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if(e==1) printf("The number %d in the col %d has been used!",g,f);
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else if(e==0) printf("The number %d in the row %d has been used!",g,f);
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else if(e==2) printf("The number %d in the block %d has been used!",g,f);
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return 0;
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}
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}
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}
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printf("True:Valid initial Sudoku matrix!\n");
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dfs(1,1,a);
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return 0;
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}
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