Compilare: user.cpp: In function ‘int main()’: user.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < str.size(); ++ i) { ~~^~~~~~~~~~~~ user.cpp:55:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i >= pattern.size() - 1) { ~~^~~~~~~~~~~~~~~~~~~~~ user.cpp:66:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++ i) ~~^~~~~~~~~~~~ user.cpp:67:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << ans[i] << " \n"[i + 1 == ans.size()]; ~~~~~~^~~~~~~~~~~~~