일상

오늘 생코글보고 만들어본 엄청큰수 연속 더하기 입니다.

by 흑엽 posted Jul 30, 2015
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단축키

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크게 작게 위로 아래로 댓글로 가기 인쇄

알고리즘 없이 루프로 더하면 엄청 오래걸리지만

합의공식 사용하면 저의 4번째 개발테스트용 똥컴;;; vmware 리눅으로도 1초 안에 계산됩니다.


$ cat 생코보고_만들어본_엄청큰수_연속더하기.sh
#!/bin/sh
#시작과 끝값중에 홀수가 있으면 코드가 더 많아짐.
echo \(\($2+1\) \*\($2 / 2\)\) -  \(\($1 + 1\) \*\($1 / 2\)\) + $1 |bc

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셀스크립트 해설

변수1부터_시작수까지_합 = (시작수+1) * (시작수 / 2)
변수1부터_끝나는수까지_합 = (끝나는수 + 1) * (끝나는수 / 2)
계산완료 = 변수1부터_끝나는수까지_합 - 변수1부터_시작수까지_합 + 시작수 #교수님이 태클걸으시면 알고리즘 없이 코딩할꺼냐고 항의하세요.

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해당 프로그램 실행


$ ./생코보고_만들어본_엄청큰수_연속더하기.sh 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