Compilare: user.cpp: In function ‘int main()’: user.cpp:25:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&nr); ^ user.cpp:29:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&n,&edges,&start); ^ user.cpp:30:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(j=1;j<=n;++j)fscanf(in,"%d",&sol[j]); ^ user.cpp:33:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&x,&here.t,&here.l); ^ user.cpp: In function ‘void dijkstra()’: user.cpp:55:11: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i,x; ^