Compilare: main.cpp: In function 'int main()': main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j< s.size();++j){ ~^~~~~~~~~~ main.cpp: In function 'void add(trie*, int)': main.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz == maxx || poz == s.size() || (t->cod) < minn) ~~~~^~~~~~~~~~~