## Sudoku solver

Solving sudoku is having fun ,thinking recursively and keep thinking until you get solution. As being a programmer i tried to solve sudoku using computational power but till now my code can solve only easy sudoku so i have try some fancy techniques as given on http://en.wikipedia.org/wiki/Algorithmics_of_sudoku . For solving hard sudoku we must have to use DFS technique but till now i can’t figure out.

int main() { int mat[10][10]; for(int i=1;i<=9;i++) for(int j=1;j0) { prepro=0; for(int i=1;i<=9;i++) for(int j=1;j<=9;j++) if(mat[i][j]==0) { int igp=((i-1)/3)*3; int jgp=((j-1)/3)*3; for(int w=1;w<=9;w++) tmp1[w]=1; for(int m=1;m<=9;m++)//row if(mat[i][m]) tmp1[mat[i][m]]=0; for(int m=1;m<=9;m++)//column if(mat[m][j]) tmp1[mat[m][j]]=0; for(int m=1;m<=3;m++)//box for(int n=1;n<=3;n++) if(mat[m+igp][n+jgp]) tmp1[mat[m+igp][n+jgp]]=0; int count=0,sol; for(int m=1;m<=9;m++) if(tmp1[m]) count++,sol=m; if(count==1)//only one possible solution mat[i][j]=sol,prepro=1; } } //printf("\n"); for(int i=1;i<=9;i++) for(int j=1;j<=9;j++) printf("%d%c",mat[i][j],(j<9)?' ':'\n'); }

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If you manage to solve trigonpuzzles using computer power, could you let me know.

You might be able to solve the simple ones but the more difficult ones are impossible to solve using an algorithm – remember there is only one correct answer

Accept the challenge

Lester Jordan

Comment by Lester Jordan | February 25, 2008 |