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Function: driver
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.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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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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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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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.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
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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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
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
폴리매스 초기 때 만든 문제였지만 삭제하고 다시 올립니다.
네 자리 수 abcd에서, a,b,c,d를 두 개씩 나누어 그 합이 서로 같게 되는 네 자리 수를 '편안한 네 자리 수'라고 하자. 예를 들어, 1234는 1+4=2+3이고, 2695는 2+9=6+5이므로 편안한 네 자리수이다.
1000~9999 사이의 네 자리 수 중, 편안한 네 자리 수는 몇 개일까?
저는 프로그래밍으로 답을 계산해서 알고 있고, 다른 유저분이 각 경우의 수를 따져 계산한 결과와 일치했습니다.
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수동에도 실린 문제다!
( 제목만 봐도 기억이 나네요.)
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sicma
Lv.11
2020.04.22 01:11
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