Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:49:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[start].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:124:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idx=0;idx<v[start].size();idx++) ^ user.cpp:165:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idx=0;idx<l[start].size();idx++) ^