Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:11:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].size(); i ++) { ~~^~~~~~~~~~~~~~~ user.cpp:10:9: warning: unused variable ‘s’ [-Wunused-variable] int s = 0; ^