0_0_15233545_28644.cpp 0_0_15233545_28644.cpp(17) : error C2065: “l”: 未声明的标识符 0_0_15233545_28644.cpp(18) : error C2065: “i”: 未声明的标识符 0_0_15233545_28644.cpp(19) : error C2065: “j”: 未声明的标识符 0_0_15233545_28644.cpp(20) : error C2065: “k”: 未声明的标识符