Compilare: user.cpp: In function ‘void update(trie*, std::__cxx11::string&, int, int)’: user.cpp:39:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == str.length()){ ^ user.cpp: In function ‘void query(trie*, std::__cxx11::string&, int)’: user.cpp:60:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == str.length()){ ^ user.cpp: In function ‘int main()’: user.cpp:93:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s[i].length(); ++j){ ^ user.cpp:81:20: warning: iteration 100004u invokes undefined behavior [-Waggressive-loop-optimizations] val[i] = -1; ^ user.cpp:80:23: note: containing loop for (int i = 1; i <= 100005; ++i){ ^