Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:30:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graf[nod].size(); ++ i) ^ user.cpp: In function ‘int bfs(int)’: user.cpp:54:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graf[nod].size(); ++ i) ^ user.cpp:72:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:106:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < graf[i].size(); ++ j) ^