Compilare: user.cpp: In function ‘char* converter(int)’: user.cpp:15:11: warning: variable ‘p’ set but not used [-Wunused-but-set-variable] char* p; ^ user.cpp: In function ‘void insertTrie(Trie*, char*, int)’: user.cpp:39:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (node->child[*s] == NULL) { ^ user.cpp:40:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] node->child[*s] = new Trie; ^ user.cpp:44:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] insertTrie (node->child[*s], s + 1, pos); ^ user.cpp: In function ‘int main()’: user.cpp:71:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("xormax.in", "r", stdin); ^ user.cpp:72:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("xormax.out", "w", stdout); ^ user.cpp:76:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &N); ^ user.cpp:79:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &X); ^