Compilare: main.cpp: In function 'void add(Trie*, int)': main.cpp:24:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) { ~~~~^~~~~~~~~~~ main.cpp: In function 'void del(Trie*, int)': main.cpp:37:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) { ~~~~^~~~~~~~~~~ main.cpp: In function 'int cnt(Trie*, int)': main.cpp:47:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) ~~~~^~~~~~~~~~~ main.cpp: In function 'int pref(Trie*, int)': main.cpp:55:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) ~~~~^~~~~~~~~~~