Compilare: user.cpp: In function ‘int main()’: user.cpp:68:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < str.size(); ++ i) { ~~^~~~~~~~~~~~ user.cpp:71:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i >= pattern.size() - 1) { ~~^~~~~~~~~~~~~~~~~~~~~ user.cpp:82:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++ i) ~~^~~~~~~~~~~~ user.cpp:83:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << ans[i] << " \n"[i + 1 == ans.size()]; ~~~~~~^~~~~~~~~~~~~ user.cpp: In instantiation of ‘static int Hasher<B, MOD>::getPow(int) [with int B = 263; int MOD = 1000000007]’: user.cpp:36:30: required from ‘void Hasher<B, MOD>::pop_front(int) [with int B = 263; int MOD = 1000000007]’ user.cpp:74:53: required from here user.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pw >= pows.size()) ~~~^~~~~~~~~~~~~~