Compilare: main.cpp: In function 'int main()': main.cpp:38:36: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<coord>::size_type {aka long unsigned int}' [-Wformat=] fprintf(fout,"%d\n",poli.size()); ^ main.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<poli.size();i++){ ~^~~~~~~~~~~~ main.cpp:48:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<poli.size()){ ~^~~~~~~~~~~~ main.cpp:50:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<poli.size() && 1LL*poli[j].x*poli[i].y==1LL*poli[j].y*poli[i].x) ~^~~~~~~~~~~~ main.cpp:28:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:30:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&r); ^