Compilare: main.cpp:44:17: warning: multi-character character constant [-Wmultichar] cout << '0\n'; ^~~~~ main.cpp: In function 'int main()': main.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pattern.size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp:60:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pattern.size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp:69:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pattern.size(); i < text.size(); ++i) ~~^~~~~~~~~~~~~