Eroare de compilare: user.cpp: In function ‘void adauga_muchii_noi(int, int)’: user.cpp:54:13: warning: unused variable ‘exista’ [-Wunused-variable] int exista = 0; ^ user.cpp: In function ‘int bfs(int)’: user.cpp:72:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[el].size(); i++) ^ user.cpp:92:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int functie_principala()’: user.cpp:114:1: error: ‘O’ was not declared in this scope O ^ user.cpp:115:5: error: expected ‘;’ before ‘return’ return nr; ^ user.cpp:116:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^