Compilare: main.cpp: In function 'int main()': main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pattern.size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp:54:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pattern.size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp:63:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pattern.size(); i < text.size(); ++i) ~~^~~~~~~~~~~~~