Compilare: main.cpp: In function 'void mark(std::__cxx11::string, std::__cxx11::string)': main.cpp:24:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < s2.size()) { ~~^~~~~~~~~~~ main.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = orig - 1; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:44:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1;i < s.size(); i++) ~~^~~~~~~~~~