0_0_39560051_32609.cpp 0_0_39560051_32609.cpp(61) : error C2065: “cin”: 未声明的标识符 0_0_39560051_32609.cpp(76) : error C2065: “cout”: 未声明的标识符 0_0_39560051_32609.cpp(78) : error C2065: “cout”: 未声明的标识符