Compilare: main.cpp: In function 'int main()': main.cpp:42:13: warning: unused variable 'val' [-Wunused-variable] int val=q.top().a; ^~~ main.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nod[no].size();++i) ~^~~~~~~~~~~~~~~ main.cpp:28:15: warning: unused variable 'j' [-Wunused-variable] int m,n,i,j,x,y,c,no,dist,cost,vecin; ^ main.cpp:31:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ main.cpp:34:38: 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,&c); ^