0_0_36631088_19763.cpp 0_0_36631088_19763.cpp(20) : error C3861: “__gcd”: 找不到标识符 0_0_36631088_19763.cpp(27) : error C3861: “__gcd”: 找不到标识符 0_0_36631088_19763.cpp(34) : error C3861: “__gcd”: 找不到标识符