Linking...
Cpp19.obj : error LNK2001: unresolved external symbol "void __cdecl print(class std::vector<class std::vector<double,class std::allocator<double> >,class std::allocator<class std::vector<double,class std::allocator<double> > > > const &)" (?print@@Y
AXABV?$vector@V?$vector@NV?$allocator@N@std@@@std@@V?$allocator@V?$vector@NV?$allocator@N@std@@@std@@@2@@std@@@Z)
Debug/Cpp19.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

Cpp19.exe - 2 error(s), 0 warning(s)
这是什么链接错误啊？