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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Cacher.php
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Function: driver

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Cacher.php
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Function: initiateCache

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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Function: _error_handler

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: model

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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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Function: getComment

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Function: _error_handler

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: model

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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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Function: get_footer

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Function: require_once

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Function: _error_handler

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
Line: 322
Function: model

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
Line: 392
Function: getFloatingMyInfo

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
Line: 559
Function: get_footer

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
Line: 315
Function: require_once

수학동아 - 폴리매스
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[창의 퍼즐] 드디어...! 20등 기념!!!
△π 2020.04.06 06:57 조회 553
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

20x20 체스판에 몇 개의 돌이 다음과 같이 놓여져있다. (a) 돌이 놓여져있지 않은 칸은 반드시 변으로 이웃한 칸 중에 돌이 놓여져있는 칸이 있다. (b) 돌이 놓여져있는 어떤 두 칸에 대해서도, 이 두 칸을 돌이 놓여져있는 칸들로만 연결하는 열이 존재한다. 단, 두 칸을 연결하는 열이란, 열의 양끝이 주어진 두 칸이고, 이 열의 연속한 두 칸은 항상 한 변을 공유하는 것이다. 이 체스판에는 몇 개 이상의 돌이 놓여있을까? 풀이과정을 쓰고 답을 구하시오.

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