Compilare: user.cpp: In function ‘void addOnTrie(int, trie*)’: user.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == in.size()) { ^ user.cpp: In function ‘int queryTrie(int, trie*)’: user.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == in.size()) ^ user.cpp: In function ‘int lenTrie(int, trie*)’: user.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == in.size()) ^ user.cpp: In function ‘bool deleteOnTrie(int, trie*)’: user.cpp:60:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == in.size()) { ^ user.cpp:59:7: warning: unused variable ‘sonDeleted’ [-Wunused-variable] bool sonDeleted; ^