[youku for Chinese]
▼ Performance(연출)
https://v.youku.com/v_show/id_XNDQ4MzczNzI4OA==.html?spm=a2h3j.8428770.3416059.1
▼ Explanation(해법)
https://v.youku.com/v_show/id_XNDQ4MzczNzU3Ng==.html?spm=a2h3j.8428770.3416059.1
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