Compilare: user.cpp: In function ‘long int permute(long int)’: user.cpp:31:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i = 0; i < divk.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:46:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%ld %ld", &n, &k); ^