Compilare: user.cpp: In function ‘int main()’: user.cpp:78:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pattern.size(); ++ i) { ~~^~~~~~~~~~~~~~~~ user.cpp:84:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pattern.size(); i <= str.size(); ++ i) { ~~^~~~~~~~~~~~~ user.cpp:87:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < str.size()) { ~~^~~~~~~~~~~~ user.cpp:96:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++ i) ~~^~~~~~~~~~~~ user.cpp:97:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << ans[i] << " \n"[i + 1 == ans.size()]; ~~~~~~^~~~~~~~~~~~~