std:: clock_t

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구현 정의 범위와 정밀도로 프로세스 실행 시간을 나타낼 수 있는 산술 타입.

clock	프로그램 시작 이후의 원시 프로세서 클럭 시간을 반환합니다 (함수)
CLOCKS_PER_SEC	초당 프로세서 클럭 틱 수 (매크로 상수)
C 문서 for clock_t

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