Compilare: user.cpp: In function ‘int main()’: user.cpp:61:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();i++) ^ user.cpp:19:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k; ^ user.cpp: In function ‘bool DFS(int)’: user.cpp:71:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[p].size();i++){ ^ user.cpp:75:22: warning: no return statement in function returning non-void [-Wreturn-type] DFS(x);}}} ^