Compilare: user.cpp: In function ‘bool bellman(int, int)’: user.cpp:34:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<graf[crt].size(); i++) ^ user.cpp: In function ‘void afisare()’: user.cpp:86:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<graf[i].size(); j++) ^ user.cpp:82:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^