Compilare: main.cpp: In function 'unsigned int cod3(std::__cxx11::string)': main.cpp:43:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<t.length(); i++) ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<l; i++) ~^~ main.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=l; i < text.length(); i++) ~~^~~~~~~~~~~~~~~