Compilare: user.cpp: In function ‘void addWord(TrieNode*, int)’: user.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (word.length() == pos - 1) { ^ user.cpp: In function ‘int queryWordCount(TrieNode*, int)’: user.cpp:43:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (word.length() == pos - 1) { ^ user.cpp: In function ‘TrieNode* deleteWord(TrieNode*, int)’: user.cpp:58:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (word.length() == pos - 1) { ^ user.cpp: In function ‘int queryLongestPrefix(TrieNode*, int)’: user.cpp:79:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (word.length() == pos - 1) { ^