Compilare: user.cpp: In function ‘void bellman_ford()’: user.cpp:23:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();++i) ^ user.cpp: In function ‘bool dijkstra()’: user.cpp:61:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();++i) ^