Std::vector::push_back throws segmentation fault?

Dfs calls itself recursively; increasing numEdges increases the recursion depth so, consequently, increasing numEdges sufficiently causes a stack overflow (which manifests as a segfault on your platform).

It's most likely that you're recursing too deeply, causing a stack overflow. On most platforms, the stack has a fixed size; you may be able to make it bigger, but you probably still won't be able to support arbitrarily large graphs.

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