Compilare: user.cpp: In function ‘int minim(int)’: user.cpp:17:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[x].size();++i) ^ user.cpp: In function ‘void djk(int)’: user.cpp:25:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[x0].size();++i) ^ user.cpp:40:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[Q.front()].size();++i) ^