hiccup.cpp: In function 'bool dfs(int, int)':
hiccup.cpp:16:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
16 | for (int i=0; i<adj[u].size(); ++i) {
| ~^~~~~~~~~~~~~~
hiccup.cpp: In function 'int HicCup(std::string)':
hiccup.cpp:27:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
27 | for (int i=0; i<s.size(); ++i) {
| ~^~~~~~~~~
hiccup.cpp:29:29: error: 'n2' was not declared in this scope; did you mean 'n'?
29 | adj[stk.top()].push_back(n2);
| ^~
| n