Compilare: user.cpp: In function ‘void trad(trie*, std::vector<int, std::allocator<int> >, int)’: user.cpp:21: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void bitty(int)’: user.cpp:40: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int xar(trie*, std::vector<int, std::allocator<int> >, int)’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void sear(int)’: user.cpp:72: warning: comparison between signed and unsigned integer expressions user.cpp:80: warning: suggest parentheses around comparison in operand of ‘^’ user.cpp: In function ‘int main()’: user.cpp:89: warning: unused variable ‘j’ user.cpp:89: warning: unused variable ‘k’