Compilare: user.cpp: In function ‘void addword(trie*, std::string, int)’: user.cpp:36:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (r-1 == wd.length()) { nod->word++; return;} ^ user.cpp: In function ‘int delword(trie*, std::string, int)’: user.cpp:48:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (r-1 == wd.length() ) nod->word--; ^ user.cpp: In function ‘int nword(trie*, std::string, int)’: user.cpp:62:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (r-1 == wd.length()) return nod->word; ^ user.cpp: In function ‘int npref(trie*, std::string, int, int)’: user.cpp:75:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((r-1 == wd.length() )|| (nod->edge[wd[r] - 'a'] == 0)) ^