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November 22, 2013 08:56
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Square detector @ Facebook hacker cup 2014 qualification round
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| <?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; | |
| } | |
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| 5 | |
| 4 | |
| ..## | |
| ..## | |
| .... | |
| .... | |
| 4 | |
| ..## | |
| ..## | |
| #... | |
| .... | |
| 4 | |
| #### | |
| #..# | |
| #..# | |
| #### | |
| 5 | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| ..... | |
| 5 | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| ##### |
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| Case #1: YES | |
| Case #2: NO | |
| Case #3: NO | |
| Case #4: NO | |
| Case #5: YES |
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| 20 | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| ..........######.... | |
| ..........######.... | |
| ..........######.... | |
| ..........######.... | |
| ..........######.... | |
| ..........######.... | |
| .................... | |
| 10 | |
| .......... | |
| .......... | |
| .##....... | |
| .##....... | |
| .......... | |
| .......... | |
| ......##.. | |
| ......##.. | |
| .......... | |
| .......... | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| ########..#######... | |
| ########..########.. | |
| ##........##....##.. | |
| ##........##....##.. | |
| ########..#######... | |
| ########..########.. | |
| ##........##....##.. | |
| ##........##....##.. | |
| ##........########.. | |
| ##........#######... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| 10 | |
| .......... | |
| .......... | |
| .......### | |
| .......### | |
| .......### | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| ...........######### | |
| 4 | |
| ..## | |
| ..## | |
| .... | |
| .... | |
| 4 | |
| #### | |
| #..# | |
| #..# | |
| #### | |
| 20 | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| ###################. | |
| 10 | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| .........# | |
| 5 | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| ..... | |
| 10 | |
| .......... | |
| .######... | |
| .#####.#.. | |
| .######... | |
| .######... | |
| .######... | |
| .######... | |
| .......... | |
| .......... | |
| .......... | |
| 10 | |
| .......... | |
| .......... | |
| ####...... | |
| ####...... | |
| ####...... | |
| ####...... | |
| .......... | |
| .......... | |
| .......... | |
| .........# | |
| 20 | |
| .................... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| ################.... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| 20 | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| #################### | |
| 4 | |
| ..## | |
| ..## | |
| #... | |
| .... | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .......##........... | |
| .......##........... | |
| 10 | |
| .......... | |
| .......... | |
| .......... | |
| ...##..... | |
| ...##..... | |
| ...##..... | |
| .......... | |
| .......... | |
| .......... | |
| .......... | |
| 4 | |
| ###. | |
| .### | |
| .### | |
| .... | |
| 5 | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| ##### | |
| 20 | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .......#####........ | |
| .......#####........ | |
| .......#####........ | |
| .......#####........ | |
| .................... | |
| .................... | |
| .................... | |
| .................... | |
| .................... |
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| 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.
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in this testcase
10
..........
..........
.##.......
.##.......
..........
..........
......##..
......##..
..........
..........
should be YES/NO
and could you upload source the third problem Tennison