Compilare: user.cpp: In function ‘void change2(Trie*, int)’: user.cpp:87:9: warning: unused variable ‘aux’ [-Wunused-variable] int aux; ^ user.cpp: In function ‘int main()’: user.cpp:159:25: warning: unused variable ‘num’ [-Wunused-variable] int i, step, op, T, num = 0; ^ user.cpp:161:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("kinder.in", "r", stdin); ^ user.cpp:162:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("kinder.out", "w", stdout); ^ user.cpp:164:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d", &n, &m, &T); ^ user.cpp:173:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &op); ^ user.cpp:175:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d", &c, &t, &p, &q); ^ user.cpp:179:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &c, &t); ^ user.cpp:183:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d", &a, &b, &p, &x); ^