Compilare: main.cpp: In function 'int prefix_cuvant(Trie*, int)': main.cpp:51:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos < cuvant.size() && nod->fii[cuvant[pos] - 'a']) ~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int aparitii_cuvant(Trie*, int)': main.cpp:58:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos < cuvant.size()) ~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'void stergere_cuvant(Trie*, int)': main.cpp:65:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos < cuvant.size() - 1) ~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:68:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos == cuvant.size() - 1) ~~~~^~~~~~~~~~~~~~~~~~~~