Compilare: user.cpp: In function ‘void DFS_down(const int&)’: user.cpp:29:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < G[nod].size(); ++ i){ ^ user.cpp: In function ‘void DFS_up(const int&)’: user.cpp:57:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < G[nod].size() ; ++ i){ ^ user.cpp:69:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < G[nod].size() ; ++ i){ ^ user.cpp:56:18: warning: variable ‘fiu2’ set but not used [-Wunused-but-set-variable] int fiu1 = 1,fiu2 = 1; ^ user.cpp: In function ‘void DFS_above(const int&)’: user.cpp:90:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < G[nod].size() ; ++ i){ ^ user.cpp:112:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < G[nod].size() ; ++ i){ ^ user.cpp:84:19: warning: variable ‘son3’ set but not used [-Wunused-but-set-variable] int son1,son2,son3; ^ user.cpp:87:16: warning: variable ‘below2’ set but not used [-Wunused-but-set-variable] int below1,below2; ^ user.cpp:127:9: warning: ‘below1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(son == below1) ^ user.cpp:120:14: warning: ‘son2’ may be used uninitialized in this function [-Wmaybe-uninitialized] else if(son == son2) ^ user.cpp:118:9: warning: ‘son1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(son == son1) ^