Compilare: user.cpp: In function ‘int main()’: user.cpp:147:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in", "r", stdin); ^ user.cpp:148:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out", "w", stdout); ^ user.cpp:86:38: warning: ‘index’ may be used uninitialized in this function [-Wmaybe-uninitialized] previous->childrens[index] = NULL; ^ user.cpp:65:7: note: ‘index’ was declared here int index; ^ user.cpp:87:37: warning: ‘previous’ may be used uninitialized in this function [-Wmaybe-uninitialized] previous->numberOfChildrens -= 1; ^ user.cpp:63:9: note: ‘previous’ was declared here Node* previous; ^