Created
November 22, 2013 08:56
-
-
Save acirtautas/7596910 to your computer and use it in GitHub Desktop.
Square detector @ Facebook hacker cup 2014 qualification round
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <?php | |
| /** | |
| * Facebook Hacker Cup 2014 Qualification Round | |
| * | |
| * Square detector | |
| * | |
| * @author Alfonsas Cirtautas | |
| */ | |
| // Read data | |
| $raw = file('square_detector_input.txt'); | |
| $cnt = reset($raw); | |
| $rez = ''; | |
| // Detect square in each image. | |
| for ($t = 1, $i=1; $i<count($raw); $i++) { | |
| $n = $raw[$i]; | |
| $c = array_slice($raw, $i+1, $n); | |
| $s = square($c, $n)?'YES':'NO'; | |
| $rez.= "Case #{$t}: {$s}".PHP_EOL; | |
| $i+= $n; | |
| $t++; | |
| } | |
| // Save results | |
| file_put_contents('square_detector_output.txt', $rez); | |
| // Where the magic happens ;) | |
| function square($canvas, $n) { | |
| // Empty canvas ? | |
| if (strpos(implode('', $canvas), '#') === false) { | |
| return false; | |
| } | |
| $rc = $cc = 0; | |
| for($i=0;$i<$n;$i++) { | |
| $canvas = checkCol($canvas, $i, $rc); | |
| $canvas = checkRow($canvas, $i, $cc); | |
| } | |
| // Is square ? | |
| if($rc !== $cc) { | |
| return false; | |
| } | |
| // Has holes ? | |
| if (strpos(implode('', $canvas), '.') !== false) { | |
| return false; | |
| } | |
| // Bingo | |
| return true; | |
| } | |
| // Check free rows | |
| function checkRow($canvas, $n, &$rc) { | |
| if(strpos($canvas[$n],'#') === false) { | |
| $canvas[$n] = str_replace('.', '*', $canvas[$n]); | |
| $rc ++; | |
| } | |
| return $canvas; | |
| } | |
| // Check free cols | |
| function checkCol($canvas, $n, &$cc) { | |
| $c = $canvas; | |
| foreach($canvas as $r => $row) { | |
| if($row[$n] == '#') { | |
| return $canvas; | |
| } | |
| $c[$r][$n] = '*'; | |
| } | |
| $cc++; | |
| return $c; | |
| } | |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 5 | |
| 4 | |
| ..## | |
| ..## | |
| .... | |
| .... | |
| 4 | |
| ..## | |
| ..## | |
| #... | |
| .... | |
| 4 | |
| #### | |
| #..# | |
| #..# | |
| #### | |
| 5 | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| ..... | |
| 5 | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| ##### |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Case #1: YES | |
| Case #2: NO | |
| Case #3: NO | |
| Case #4: NO | |
| Case #5: YES |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 20 | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| ..........######.... | |
| ..........######.... | |
| ..........######.... | |
| ..........######.... | |
| ..........######.... | |
| ..........######.... | |
| .................... | |
| 10 | |
| .......... | |
| .......... | |
| .##....... | |
| .##....... | |
| .......... | |
| .......... | |
| ......##.. | |
| ......##.. | |
| .......... | |
| .......... | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| ########..#######... | |
| ########..########.. | |
| ##........##....##.. | |
| ##........##....##.. | |
| ########..#######... | |
| ########..########.. | |
| ##........##....##.. | |
| ##........##....##.. | |
| ##........########.. | |
| ##........#######... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| 10 | |
| .......... | |
| .......... | |
| .......### | |
| .......### | |
| .......### | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| 4 | |
| ..## | |
| ..## | |
| .... | |
| .... | |
| 4 | |
| #### | |
| #..# | |
| #..# | |
| #### | |
| 20 | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| ###################. | |
| 10 | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .........# | |
| 5 | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| ..... | |
| 10 | |
| .......... | |
| .######... | |
| .#####.#.. | |
| .######... | |
| .######... | |
| .######... | |
| .######... | |
| .......... | |
| .......... | |
| .......... | |
| 10 | |
| .......... | |
| .......... | |
| ####...... | |
| ####...... | |
| ####...... | |
| ####...... | |
| .......... | |
| .......... | |
| .......... | |
| .........# | |
| 20 | |
| .................... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| 20 | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| 4 | |
| ..## | |
| ..## | |
| #... | |
| .... | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .......##........... | |
| .......##........... | |
| 10 | |
| .......... | |
| .......... | |
| .......... | |
| ...##..... | |
| ...##..... | |
| ...##..... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| 4 | |
| ###. | |
| .### | |
| .### | |
| .... | |
| 5 | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .......#####........ | |
| .......#####........ | |
| .......#####........ | |
| .......#####........ | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Case #1: YES | |
| Case #2: NO | |
| Case #3: NO | |
| Case #4: YES | |
| Case #5: YES | |
| Case #6: YES | |
| Case #7: NO | |
| Case #8: NO | |
| Case #9: YES | |
| Case #10: NO | |
| Case #11: NO | |
| Case #12: NO | |
| Case #13: NO | |
| Case #14: YES | |
| Case #15: NO | |
| Case #16: YES | |
| Case #17: NO | |
| Case #18: NO | |
| Case #19: YES | |
| Case #20: NO |
NO. Here not all the '#' (Black) are together making one square
Exactly jitendratheta, there was a rule, that ALL #'s must form a square.
Ant Sorry, I had no time to solve Tennison problem.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
in this testcase
10
..........
..........
.##.......
.##.......
..........
..........
......##..
......##..
..........
..........
should be YES/NO
and could you upload source the third problem Tennison