Compilare: user.cpp: In function ‘int main()’: user.cpp:121:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok = 1; ^ user.cpp:110:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv8.in", "r", stdin); ^ user.cpp:111:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv8.out", "w", stdout); ^ user.cpp:115:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &tip); ^ user.cpp:126:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] case 'I': {int k, e; scanf("%d%d", &k, &e); root = insert(root, k ,e); break;} ^ user.cpp:127:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] case 'A': {int k; scanf("%d", &k); printf("%d\n", access(root, k)); break;} ^ user.cpp:128:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] case 'R': {int i, j; scanf("%d%d", &i, &j); root = reverse(root, i, j); break;} ^ user.cpp:129:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] case 'D': {int i, j; scanf("%d%d", &i, &j); root = erase(root, i, j); break;} ^