Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:20:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gr[vf].size();i++) ^ user.cpp: In function ‘void euler(int)’: user.cpp:71:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gr[vf].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:103:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ciclu.size();i++) ^ user.cpp:88:8: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^