Compilare: main.cpp: In function 'int main()': main.cpp:99:32: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(OUT,"%d\n",o.size()); ^ main.cpp:101:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<o.size(); i++) ~^~~~~~~~~ main.cpp:65:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&N,&S); ^ main.cpp:71:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&x); ^