Compilare: user.cpp: In function ‘std::pair<_treap*, _treap*> splt(_treap*&, int)’: user.cpp:73:13: warning: unused variable ‘l’ [-Wunused-variable] _treap *l, *r; ^ user.cpp:73:17: warning: unused variable ‘r’ [-Wunused-variable] _treap *l, *r; ^ user.cpp: In function ‘int main()’: user.cpp:187:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bile4.in", "r", stdin); ^ user.cpp:188:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bile4.out", "w", stdout); ^ user.cpp:193:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:199:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &op, &st, &dr, &k); ^