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这题的意思到底是所有侯选type都要用至少一次？还是可以从中任取？如题。 比如：Input 1 5 5 5 4 3 2 1 Output:?? 如果是所有类型5,4,3,2,1都要利用至少一次（更难），需要全搜才可以作出判断。如果可以任选，全部用1来填，显然应该输出Yes. Followed by:
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