Compilare: main.cpp: In function 'void dfs(int)': main.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[nod].size() && !found; ++i) ~^~~~~~~~~~~~~~ main.cpp: In function 'void solve_case()': main.cpp:85:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (sol.size() != 2 * n && nr[1] < 2) ~~~~~~~~~~~^~~~~~~~ main.cpp:90:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<sol.size(); ++i) ~^~~~~~~~~~~