Compilare: user.cpp: In function ‘void bfs()’: user.cpp:19:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(size_t i=0;((i<dim) && (!viz[y]));i++) ^ user.cpp: In function ‘int main()’: user.cpp:39:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d %d",&n,&m,&x,&y); ^ user.cpp:43:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d",&a,&b,&d); ^