finish hw3 #56
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finish hw3 #56
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1.使用模板实现不同类型vector的输出/相加
2.使用decltype(T1{}+T2{})判断相加后的类型
3.variant+visit+lambda,调用上面实现的相加/输出程序。返回值需要显式表示是variant
4.需要实现variant+原始类型的函数