#include <stdio.h>#include <stdlib.h>int *fillnumber(int a[9][9][10],int number,int i,int j){ for (int k=0;k<9;k++){  a[i][k][number]++;  a[k][j][number]++; } for (int n=0;n<3;n++){  for (int m=0;m<3;m++){   a[i/3*3+n][j/3*3+m][number]++;  } } return a;}int *resetnumber(int a[9][9][10],int number,int i,int j){ for (int k=0;k<9;k++){  a[i][k][number]--;  a[k][j][number]--; } for (int n=0;n<3;n++){  for (int m=0;m<3;m++){   a[i/3*3+n][j/3*3+m][number]--;  } } return a;}void search(int step, int a[9][9],int g[9][9][10]){ if (step==0) {  for (int i=0;i<9;i++){   for (int j=0;j<9;j++){    printf("%d ",a[i][j]);   }   printf("/n");  }  exit(0); } for (int i=0;i<9;i++){  for (int j=0;j<9;j++){   if (a[i][j]==0) {    for (int number=1;number<10;number++){     if (g[i][j][number]==0){      fillnumber(g,number,i,j);      a[i][j]=number;      search(step-1,a,g);      a[i][j]=0;      resetnumber(g,number,i,j);     }    }    return;   }  } }}int main(int argc, const char * argv[]) { int a[9][9]; int abool[9][9][10]; int step=0; for (int i =0;i<9;i++){  for (int j=0;j<9;j++){   for (int k=1;k<10;k++) {    abool[i][j][k]=0;   }  } } for (int i =0;i<9;i++){  for (int j=0;j<9;j++){   scanf("%d",&a[i][j]);   if (a[i][j]==0) {    step++;   }   else{    fillnumber(abool,a[i][j],i,j);   }  } } search(step,a,abool); return 0;}