View Compilation Error

0_0_20401634_14403.cpp
0_0_20401634_14403.cpp(57) : error C2065: “G”: 未声明的标识符
0_0_20401634_14403.cpp(57) : error C2228: “.clear”的左边必须有类/结构/联合
0_0_20401634_14403.cpp(71) : error C2065: “G”: 未声明的标识符
0_0_20401634_14403.cpp(71) : error C2228: “.size”的左边必须有类/结构/联合
0_0_20401634_14403.cpp(72) : error C2065: “G”: 未声明的标识符