Compilare: main.cpp: In function 'void read()': main.cpp:19:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < s.size(); ++j) ~~^~~~~~~~~~ main.cpp:21:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(isalpha(s[j]) && j < s.size()) curent += s[j++]; ~~^~~~~~~~~~ main.cpp: In function 'int dist(std::__cxx11::string, std::__cxx11::string)': main.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= a.size(); ++i) ~~^~~~~~~~~~~ main.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= b.size(); ++i) ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cuv.size() - 1; ++i) ~~^~~~~~~~~~~~~~~~ main.cpp:59:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j < cuv.size(); ++j) ~~^~~~~~~~~~~~