Compilare: main.cpp: In function 'int parse(std::__cxx11::string, int)': main.cpp:16:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i != input.length()) ~~^~~~~~~~~~~~~~~~~ main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i != input.length() && input[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 < paths.size(); i++) ~~^~~~~~~~~~~~~~