Compilare: main.cpp: In function 'int main()': main.cpp:56:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= min((ull)freqs_X, tot_freqs - M + 1); ++i) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:56:34: warning: 'freqs_X' may be used uninitialized in this function [-Wmaybe-uninitialized] for (int i = 1; i <= min((ull)freqs_X, tot_freqs - M + 1); ++i) ^~~~~~~~~~~~