Compilare: main.cpp: In function 'int main()': main.cpp:52:18: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<XY>::size_type' {aka 'long unsigned int'} [-Wformat=] 52 | fprintf(fout,"%d\n",q.size()); | ~^ ~~~~~~~~ | | | | int std::vector<XY>::size_type {aka long unsigned int} | %ld main.cpp:53:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<XY>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for(i=0;i<q.size();i++){ | ~^~~~~~~~~