Compilare: user.cpp: In function ‘int main()’: user.cpp:98:42: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘std::vector<r>::size_type {aka unsigned int}’ [-Wformat=] fprintf(fo, "%lu\n", rectangles.size()); ^ user.cpp:83:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%u\n", &t); ^ user.cpp:86:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%u %u %u\n", &row, &col, &rect_MAX); ^