Compilare: main.cpp: In function 'std::__cxx11::string findsz(char)': main.cpp:20:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(query(s) == s.size() - 1) ~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'std::__cxx11::string merget(std::__cxx11::string, std::__cxx11::string)': main.cpp:30:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p == a.size()) { ~~^~~~~~~~~~~ main.cpp:33:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] } else if(p2 == b.size()){ ~~~^~~~~~~~~~~ main.cpp:36:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] } else if(query(s + a[p] + b.substr(p2 , b.size() - 1)) == 1 + p + b.size()){ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~