Compilare: user.cpp: In constructor ‘Node::Node(char, int, int, Node*, Node*)’: user.cpp:8:18: warning: ‘Node::right’ will be initialized after [-Wreorder] Node *left, *right; ^ user.cpp:7:17: warning: ‘int Node::hash1’ [-Wreorder] int pr, sz, hash1, hash2; ^ user.cpp:10:5: warning: when initialized here [-Wreorder] Node(char key, int pr, int sz, Node *left, Node *right): ^ user.cpp: In function ‘int main()’: user.cpp:84:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:86:29: 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:87:18: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(str + 1); ^ user.cpp:103:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &op); ^ user.cpp:105:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %c", &p, &x); ^ user.cpp:112:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &q1, &q2, &lg); ^ /tmp/ccqNMPsS.o: In function `main': user.cpp:(.text.startup+0xd9): warning: the `gets' function is dangerous and should not be used.