Compilare: user.cpp: In function ‘int bfs()’: user.cpp:36:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G[node].size();++i) ^ user.cpp: In function ‘int dfs(int)’: user.cpp:51:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:81:6: warning: unused variable ‘change’ [-Wunused-variable] int change = 1; ^