Category : abstract-data-type

I know where error comes from. I have already marked it below the c++ code. I have no idea about this error. Hope someone help me. How to fix this problem? The error is: Undefined symbols for architecture x86_64: "operator<<(std::__1::basic_ostream<char, std::__1::char_traits >&, Stack&)", referenced from: Path(int, int) in main.o ld: symbol(s) not found for architecture ..

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