Compilare: main.cpp: In function 'int main()': main.cpp:43:36: 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:47:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<poli.size()){ ~^~~~~~~~~~~~ main.cpp:49:14: 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:54:35: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(fout,"%d\n",sol.size()); ^ main.cpp:55:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ~^~~~~~~~~~~ main.cpp:45:9: warning: unused variable 'nrdif' [-Wunused-variable] int nrdif=0; ^~~~~ main.cpp:29:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:31:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&r); ^