Online JudgeProblem SetAuthorsOnline ContestsUser
Web Board
Home Page
F.A.Qs
Statistical Charts
Problems
Submit Problem
Online Status
Prob.ID:
Register
Update your info
Authors ranklist
Current Contest
Past Contests
Scheduled Contests
Award Contest
User ID:
Password:
  Register
北京大学《ACM-ICPC竞赛训练》暑期课面向全球招生。容量有限,报名从速!
Language:
Quadtree II or: Florida Jones strikes back
Time Limit: 1000MSMemory Limit: 65536K
Total Submissions: 385Accepted: 197

Description

Having realized that the quadtree-encoded treasure map was a fake, Florida Jones maliciously plans to also play a prank for the next treasure hunter after him. But for that, he needs your help once again:

Can you write a program that takes a picture in the XBM format and encodes it with the quadtree scheme?

Input

The first line will be "#define quadtree_width n" where n is the picture size in pixels. (The picture is quadratic: n*n pixels)
The second line will be "#define quadtree_height n" accordingly.
The third line will be "static char quadtree_bits[] = {".
Then, n lines will follow, each one encoding one pixel row of the picture. There will be n/8 hexadecimal numbers per line.
Each hexadecimal number is composed of 8 bits that encode 8 pixels from left to right (where the leftmost bit has the value 1 and the rightmost bit has the value 128). The hexadecimal numbers are printed in the form 0xdd where d is one character of the set { 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f }.
Example: The 8 pixels WBBBBWWB are written as 0x9e. (2+4+8+16+128 = 158 = 0x9e)
After each hexadecimal number, a comma follows.
The last line will be "};".
Note: The comments (enclosed by /* and */) in the sample input are not part of the input. They should help to explain the XBM format

Output

First, print the integer n (8 <= n <= 512) on a line by itself.
Then, print a string consisting of the letters B, W and Q that correctly encodes the picture with the quadtree scheme.
Finally, terminate the string with a newline character.

Sample Input

#define quadtree_width 16
#define quadtree_height 16
static char quadtree_bits[] = {
0xf0,0xf0,                       /* WWWWBBBB WWWWBBBB */
0xf0,0xf0,                       /* WWWWBBBB WWWWBBBB */
0xf0,0xf0,                       /* WWWWBBBB WWWWBBBB */
0xf0,0xf0,                       /* WWWWBBBB WWWWBBBB */
0x0f,0x0f,                       /* BBBBWWWW BBBBWWWW */
0x0f,0x0f,                       /* BBBBWWWW BBBBWWWW */
0x0f,0x0f,                       /* BBBBWWWW BBBBWWWW */
0x0f,0x0f,                       /* BBBBWWWW BBBBWWWW */
0xf0,0xf0,                       /* WWWWBBBB WWWWBBBB */
0xf0,0xf0,                       /* WWWWBBBB WWWWBBBB */
0xf0,0xf0,                       /* WWWWBBBB WWWWBBBB */
0xf0,0xf0,                       /* WWWWBBBB WWWWBBBB */
0x0f,0x0f,                       /* BBBBWWWW BBBBWWWW */
0x0f,0x0f,                       /* BBBBWWWW BBBBWWWW */
0x0f,0x0f,                       /* BBBBWWWW BBBBWWWW */
0x0f,0x0f,                       /* BBBBWWWW BBBBWWWW */
};

Sample Output

16
QQWBBWQWBBWQWBBWQWBBW

Hint

Since the problems "Quadtree" and "Quadtree II" are inverse to each other, you can double check your programs by converting back and forth between the respective input and output files.

Source

[Submit]   [Go Back]   [Status]   [Discuss]

Home Page   Go Back  To top


All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator