Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++){ ~^~~~~~~~~~~~ user.cpp:21:11: warning: unused variable ‘pm’ [-Wunused-variable] int y,pm=0; ^~ user.cpp: In function ‘void dfs2(int)’: user.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++){ ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:69:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<r.size();i++){ ~^~~~~~~~~