※ 引述《shingee (請贊助盧彥勳)》之銘言：
: 用打的好像反而難看的懂題目
: 題目是裡面的第三題
: http://www.lib.nctu.edu.tw/n_exam/exam92/ims/ims493.pdf
: 感謝
what's your problem?
may you provide some initial thought.
You could use the definition if you did not know how to handle it.
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