0_0_35149406_23408.cpp 0_0_35149406_23408.cpp(6) : error C2065: “cin”: 未声明的标识符 0_0_35149406_23408.cpp(9) : error C2065: “cin”: 未声明的标识符 0_0_35149406_23408.cpp(17) : error C3861: “swap”: 找不到标识符