Compilare: user.cpp: In function ‘void solve()’: user.cpp:107:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[x].size();++i) ^ user.cpp:119:19: warning: suggest parentheses around assignment used as truth value [-Wparentheses] tata[j]=viz[j]=grad[j]=subarb[j]=dist[j]=heap[j]=nod[j]=0; ^ user.cpp:126:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(it=0;it<G[x].size();++it) ^ user.cpp:146:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(it=0;it<G[i].size();++it) ^ user.cpp:156:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[y].size();++j) ^ user.cpp:100:14: warning: variable ‘nr’ set but not used [-Wunused-but-set-variable] { int i,j,it,nr,x,y,r; ^ user.cpp:159:15: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol=dist[i]-r; ^