Compilare: main.cpp: In function 'int main()': main.cpp:55:45: 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 %d\n", sol.size(), answer) ; ^ main.cpp:28:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n) ; ^ main.cpp:30:52: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &v[i].height, &v[i].weight); ^