Compilare: main.cpp: In function 'bool sub(std::__cxx11::string, std::__cxx11::string)': main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<in1.size(); i++) ~^~~~~~~~~~~ main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<in2.size(); i++) ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[i].size() >= maxLen) ~~~~~~~~~~~~^~~~~~~~~ main.cpp:66:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[i].size() == maxLen) ~~~~~~~~~~~~^~~~~~~~~ main.cpp:75:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[i].size() == maxLen) ~~~~~~~~~~~~^~~~~~~~~