Compilare: main.cpp: In function 'bool verif_spatiu(std::__cxx11::string)': main.cpp:10:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.length(); i++) ~^~~~~~~~~~~ main.cpp: In function 'bool verif_caracter(std::__cxx11::string)': main.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.length(); i++) ~^~~~~~~~~~~ main.cpp: In function 'int rezolva(std::__cxx11::string)': main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<text.length(); i++) ~^~~~~~~~~~~~~~ main.cpp:32:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<text.length(); i++) ~^~~~~~~~~~~~~~ main.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<text.length(); i++) ~^~~~~~~~~~~~~~