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View Compilation Error

621980_0_0_684.cpp
621980_0_0_684.cpp(1) : error C2871: “std” : 具有该名称的命名空间不存在
621980_0_0_684.cpp(5) : error C2065: “cin” : 未声明的标识符
621980_0_0_684.cpp(5) : fatal error C1903: 无法从以前的错误中恢复；正在停止编译


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