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:26:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a>cur) ^ user.cpp: In function ‘int main()’: user.cpp:41:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%hu %hu %hu %hu",&n,&m,&x,&y); ^ user.cpp:44:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%hu %hu %lu\n",&a,&b,&d); ^