Array ( [0] => Array ( [title] => L18A [link] => https://www.youtube.com/embed/xDNyQRMyLCM ) [1] => Array ( [title] => L18B [link] => https://www.youtube.com/embed/vNXSZd63tuw ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第18R講 Introduction to Graph Theory