Compilare: main.cpp: In function 'long long int count(std::__cxx11::string, std::__cxx11::string)': main.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j <= b.size(); j++) ~~^~~~~~~~~~~ main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= a.size(); i++) ~~^~~~~~~~~~~ main.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1; j <= b.size(); j++) ~~^~~~~~~~~~~