ACM PKU 2636 Sudoku http://acm.pku.edu.cn/JudgeOnline/problem?id=2676

数独问题：

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#include <iostream>
using namespace std;

int num[11][11];
int Case;

void input()
{
 
 memset(num,0,sizeof(num));

 int i,j;
 for (i = 0;i <9; i++)
  for (j = 0;j < 9; j++)
  {
   char a;
   cin >> a;
   num[i][j] = a - '0';
  }
}

void output()
{
    int i,j;
 for (i = 0;i < 9; i++)
 {
  for (j = 0;j < 9; j++)
   cout<<num[i][j];
  cout<<endl;
 }
}

bool row( int n , int figure)
{
 int i = 0 ;
 for (; i < 9; i++)
 {
  if (i == n % 9)   continue;
  if (num[n/9][i] == figure) 
   return false;
 }
 return true;
}

bool column(int n, int figure)
{
 int i = 0;
 for (;i < 9; i++)
 {
  if (i == n / 9 )   continue;
  if (num[i][n%9] == figure)
   return false;
 }
 return true;
}

bool squre(int n, int figure)
{
 int i, j ;
 int t0 = n/9/3*3, t1 = (n%9)/3*3;
 for (i = t0 ;i < t0+3; i++)
  for (j = t1;j < t1+3; j++)
  {
   if (i == n/9 && j == n%9)  continue;
   if (num[i][j] == figure)
    return false;
  }
  return true;
}

int solve(int deep)
{
 int i; 
 if (deep == -1) return 1;
 if (num[deep/9][deep%9] != 0)
  return solve (deep-1);  
 else
 {
  for(i = 1; i <= 9 ;i++)
  {
   num[deep/9][deep%9] = i;
   if (row(deep,i) && column(deep,i) && squre(deep,i)) 
   {
    if(solve(deep-1))   
     return 1;
   }    
   num[deep/9][deep%9] = 0;
  } 
  return 0;
 } 
}

int main ()
{
 cin >> Case;
 while (Case--)
 {
  input();
  solve(80);
  output();
 }
 return 0;
}