Compilare: main.cpp: In function 'void Solver::dfs(int, int)': main.cpp:12:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for (int i = 0;i < e[nod].size();i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'bool Solver::PairUp(int)': main.cpp:20:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for (int i = 0;i < e[nod].size();i++) { | ~~^~~~~~~~~~~~~~~ main.cpp:27:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for (int i = 0;i < e[nod].size();i++) { | ~~^~~~~~~~~~~~~~~ main.cpp:34:5: warning: control reaches end of non-void function [-Wreturn-type] 34 | } | ^