Compilare: user.cpp: In function ‘bool dfs(int)’: user.cpp:51:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[u1].size(); i++){ ^ user.cpp: In function ‘void bfs()’: user.cpp:82:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[u1].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:121:11: warning: unused variable ‘x’ [-Wunused-variable] int x, y; ^ user.cpp:121:14: warning: unused variable ‘y’ [-Wunused-variable] int x, y; ^