Compilare: main.cpp: In function 'int main()': main.cpp:100:33: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<double>::size_type {aka long unsigned int}' [-Wformat=] fprintf(fout,"%d\n",ans.size()); ^ main.cpp:31:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:33:71: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&v[i][0].x,&v[i][0].y,&v[i][1].x,&v[i][1].y); ^ main.cpp:56:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&mat[i][2*n+1]); ^