Compilare: user.cpp: In function ‘void dijkstra(int, int, int, int)’: user.cpp:81:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<a[x.ind].size();i++) ^ user.cpp: In function ‘void rec(int, int)’: user.cpp:108:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<sol.size();i++) fprintf(g,"%d ",sol[i]); ^ user.cpp: In function ‘void read()’: user.cpp:26:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:27:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&A,&B,&C); ^ user.cpp:32:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&x,&y,&z); ^ user.cpp: In function ‘void solve()’: user.cpp:136:19: warning: ‘mni’ may be used uninitialized in this function [-Wmaybe-uninitialized] rec(mni,i); ^