0_0_39105892_16499.cpp
0_0_39105892_16499.cpp(16) : error C3861: “acos”: 找不到标识符
0_0_39105892_16499.cpp(18) : error C3861: “scanf”: 找不到标识符
0_0_39105892_16499.cpp(26) : error C3861: “scanf”: 找不到标识符
0_0_39105892_16499.cpp(33) : error C3861: “scanf”: 找不到标识符
0_0_39105892_16499.cpp(45) : error C3861: “printf”: 找不到标识符
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