Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:19:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for (int i=0; i<v[nod].size (); i++) | ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:55:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for (i=0; i<sol.size (); i++) | ~^~~~~~~~~~~~ main.cpp:57:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for (j=0; j<sol[i].size (); j++) | ~^~~~~~~~~~~~~~~