Do it now!

#include <stdio.h>
#include <io.h>

int main(void) {
  _finddatai64_t file;
  intptr_t files;

  files = _findfirsti64("*.*", &file);
  do {
      printf("%s\n", file.name);
  } while(_findnexti64(files, &file) == 0);
  _findclose(files);

  return 0;
}

#include <iostream>
#include <list>
using namespace std;

class CData {
public:
    CData (int x = 0) { data = x; }
    void set (int x) { data = x; }
    int  get (void)  { return data ; }
    // 방법 1: 비교를 위한 함수를 만든다.
    int operator()( CData &lhv, CData &rhv) const { return (lhv.get() > rhv.get()); }
    // 방법 2: < 연산자를 오버로딩 한다.
    int operator<( CData &rhv) const { return (this->data < rhv.get()); }
 
private:
    int data;       
};

void process(void);
void prinfList( list<CData> myList );

int main (int argc, char **argv)
{

    process();
   
    getchar();
    return 0;   
}

void process (void)
{
     list<CData> myData;

         
     myData.push_front(10);
     myData.push_front(17);
     myData.push_front(11);
     myData.push_front(1);
     myData.push_front(20);

     prinfList( myData );
 
     // STL의 list는 제너릭한 sort를 사용할 수 없다.
     // 멤버함수를 호출하면 < 연산자를 비교 함수로 쓴다.
     myData.sort();         // method 2
     prinfList( myData );
    // 직접 비교 함수를 넣을 수도 있다.
     myData.sort(CData()); // metod 1
     prinfList( myData );
}

void prinfList( list<CData> myList )
{
     list<CData> :: iterator iter;
    
     for (iter = myList.begin(); iter != myList.end(); iter++)
         cout << iter->get() << " ";
     cout << endl;
}

#!/usr/local/bin/python
#-*- coding: cp949 -*-
# date   : 2006.  10.  15
#
# 스도쿠를 풀어주는 스크립트

import random

class Sodoku:
 def __init__(self):
  self.timer = 0
  self.board = []
  self.tmpBoard=[]
  for y in range(0, 82):
   self.board.append(0)
   self.tmpBoard.append(511)

 def display(self):

  for y in range(0, 9):
   for x in range(0, 9):
    idx = y* 9 + x + 1;

    if self.board[idx] != 0:
     print "%d" %(self.board[idx]),
    else:
     print "_",
    print '|',
   print '\n'
 
 def checkSquare(self,  sx,  sy):
  sum = 0;
 
  for y in range(0, 3):
   for x in range(0, 3):
    if ( int(self.board[ (y+sy)*9+(x+sx)+1]) > 0):
     sum |= (1 << (int(self.board[ (y+sy)*9+(x+sx)+1]-1)))
  return sum

 def checkBoard(self):
  ret = 0;
  for y in range(0, 9):
   sum = 0;
   for x in range(0, 9):
    if ( int(self.board[y*9+x+1]) > 0):
     sum |= (1 << (int(self.board[y*9+x+1]-1)))
   if (sum != 511):
    ret = 1
   
  for x in range(0, 9):
   sum = 0;
   for y in range(0, 9):
    if ( int(self.board[y*9+x+1]) > 0):
     sum |= (1 << (int(self.board[y*9+x+1]-1)))
   if (sum != 511):
    ret = 2

  for y in range(0, 3):
   for x in range(0, 3):
    sum = self.checkSquare(x*3, y*3)
   if (sum != 511):
    ret = 3
  return ret

 def readData(self):
  fp = open("sudoku.dat", 'r')
  self.board = map(int, fp.read().split(','))
  fp.close()
 
  for y in range(0, 82):
   self.tmpBoard[y] =511
 
 def guessCount(self, num):
  count = 0
  for i in range(0, 9):
   if ( (1 << i) & num ) != 0:
    count += 1
  return count

 def findStartPos(self):
  sx = 0
  sy = 0
  mvalue = 511
  mcount = 10
  for y in range(0,9):
    for x in range(0,9):
     if (self.board[y * 9 + x + 1] == 0):
      temp = self.guessCount(self.tmpBoard[y*9 + x + 1] )
      if (mcount >  temp):
       mvalue = self.tmpBoard[y*9 + x + 1]
       mcount = temp
       sx = x
       sy = y
  return (sx, sy, mvalue)

 def isFull(self):
  count = 0
  for y in range(0,9):
    for x in range(0,9):
     if (self.board[y * 9 + x + 1] != 0):
      count += 1
  return count == 81

 def solve(self):
  if (self.checkBoard() != 0):
   if (self.isFull()):
    return 0
   #get position
   (x, y, num) = self.findStartPos()
   # set number
   for i in range(0, 9):
    if ( (1 << i) & num ) != 0:
     self.board[y*9 + x + 1] = i+1
     # checkTempBoard
     self.checkWidthTempBoard(x, y)
     self.checkHeightTempBoard(x, y)
     self.checkSquareTempBoard(x/3, y/3, x, y)
     if (self.solve() == 1):
       return 1
     else:
      self.unCheckWidthTempBoard(x, y)
      self.unCheckHeightTempBoard(x, y)
      self.unCheckSquareTempBoard(x/3, y/3, x, y)
      self.board[y*9 + x + 1] = 0
   return 0
  else:
   return 1

       
 def checkTempBoard(self):
  for y in range(0, 9):
   for x in range(0, 9):
    if (self.board[y * 9 + x + 1] != 0):
     self.checkWidthTempBoard(x, y)
     self.checkHeightTempBoard(x, y)
     self.checkSquareTempBoard(x/3, y/3, x, y)
 
 def checkWidthTempBoard(self, sx, sy):
   for x in range(0,9):
    if (self.board[sy * 9 + x + 1] == 0):
     self.tmpBoard[sy * 9 + x + 1] &= ~(1 << (self.board[sy * 9 + sx + 1] - 1))

 def checkHeightTempBoard(self, sx, sy):
   for y in range(0,9):
    if (self.board[y * 9 + sx + 1] == 0):
     self.tmpBoard[y * 9 + sx + 1] &= ~(1 << (self.board[sy * 9 + sx + 1] - 1))

 def checkSquareTempBoard(self, sx, sy, tx, ty):
   for y in range(0,3):
    for x in range(0,3):
     if (self.board[(y + sy) * 9 + sx + x + 1] == 0):
      self.tmpBoard[(y + sy * 3) * 9 + sx * 3 + x + 1] &= ~(1 << (self.board[ty * 9 + tx + 1] - 1))    

 def unCheckWidthTempBoard(self, sx, sy):
   for x in range(0,9):
    if (self.board[sy * 9 + x + 1] == 0):
     self.tmpBoard[sy * 9 + x + 1] |=  (1 << (self.board[sy * 9 + sx + 1] - 1))
     
 def unCheckHeightTempBoard(self, sx, sy):
   for y in range(0,9):
    if (self.board[y * 9 + sx + 1] == 0):
     self.tmpBoard[y * 9 + sx + 1] |= (1 << (self.board[sy * 9 + sx + 1] - 1))
     
 def unCheckSquareTempBoard(self, sx, sy, tx, ty):
   for y in range(0,3):
    for x in range(0,3):
     if (self.board[(y + sy) * 9 + sx + x + 1] == 0):
      self.tmpBoard[(y + sy * 3) * 9 + sx * 3 + x + 1] |= (1 << (self.board[ty * 9 + tx + 1] - 1))

 def generate(self):
  self.readData()
  self.checkTempBoard()

def main():
 sodoku = Sodoku()
 
 sodoku.generate()
 sodoku.display()
 sodoku.solve()
 print "-"*60
 sodoku.display()

#----------------------------------------------------------
# main
if __name__ == "__main__":    
   main()

def LoadData():
    if os.path.exists(filename):
        fp = open(filename, 'r')
        tempFileData = fp.read()
        fp.close()
   
        text.insert(1.0, tempFileData.decode('cp949'))   
   
def SaveData():
    textData = text.get(1.0, END).encode('cp949')
   
    fp = open(filename, 'w')
    fp.write(textData)
    fp.close()
       
def ShowInfo():
    tkMessageBox.showinfo("Information","http://chobocho.com\nVersion 0.2")
   
   
#----------------------------------------------------------
# main
if __name__ == "__main__":     
    root = Tk()
   
    text = Text(root, width=50, height = 20)
    text.pack()
    append_button  = Button(root, text="Append", command = AppendData)
    save_button  = Button(root, text="Save", command = SaveData)
    clear_button = Button(root, text="Clear", command = ClearText)
    load_button = Button(root, text="Load", command = LoadData)
    info_button = Button(root, text="Info", command = ShowInfo)

    info_button.pack(side=RIGHT)
    load_button.pack(side=RIGHT)
    clear_button.pack(side=RIGHT)
    save_button.pack(side=RIGHT)
    append_button.pack(side=RIGHT)

    root.mainloop()