Compilare: user.cpp: In function ‘void query(Trie*, char*)’: user.cpp:69:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (it->rel >= node->rel) { rel = it->rel; break; } ^ user.cpp: In function ‘void update(Trie*, char*, int)’: user.cpp:115:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (rel > node->rel || (rel == node->rel && CH < node->best)) ^ user.cpp:115:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (rel > node->rel || (rel == node->rel && CH < node->best)) ^ user.cpp: In function ‘int main()’: user.cpp:125:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ user.cpp:131:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &N, &M); ^ user.cpp:136:19: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] insert(T, line); ^ user.cpp:139:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, 50, stdin); ^