Compilare: user.cpp: In function ‘void dijkstra(int, int)’: user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<cost[x0].size();i++) ^ user.cpp:60:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<cost[u].size();i++) ^ user.cpp:32:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int main()’: user.cpp:78:15: warning: unused variable ‘j’ [-Wunused-variable] int m,n,i,j,x,y,x0; ^ user.cpp:105:21: warning: ‘x0’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(d[i]<inf && i!=x0) ^