Compilare: main.cpp: In function 'void add(std::__cxx11::string&, int, node*)': main.cpp:27:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz==s.size()) ~~~^~~~~~~~~~ main.cpp: In function 'void del(std::__cxx11::string&, int, node*)': main.cpp:41:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz==s.size()) ~~~^~~~~~~~~~ main.cpp: In function 'void cnt(std::__cxx11::string&, int, node*)': main.cpp:50:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz==s.size()) ~~~^~~~~~~~~~ main.cpp: In function 'void tr(std::__cxx11::string&, int, node*)': main.cpp:68:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz==s.size()) ~~~^~~~~~~~~~