Compilare: main.cpp: In function 'void ins(Trie*, int, int)': main.cpp:44:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==s.size()) ~^~~~~~~~~~ main.cpp: In function 'void del(Trie*, int)': main.cpp:72:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==s.size()) ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:87:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<s.size(); j++) ~^~~~~~~~~ main.cpp:95:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<s.size(); j++) ~^~~~~~~~~