Compilare: main.cpp: In function 'int main()': main.cpp:68:35: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<std::set<int> >::size_type {aka long unsigned int}' [-Wformat=] fprintf(out,"%d\n",comp.size()); ^ main.cpp:70:37: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::set<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(out,"%d ",vec.size()); ^ main.cpp:48:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ main.cpp:51:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&x,&y); ^