Compilare: main.cpp: In function 'void update(treap*)': main.cpp:30:8: warning: unused variable 'ok' [-Wunused-variable] ll ok=0; ^~ main.cpp: In function 'int main()': main.cpp:128:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zeap.in","r",stdin); ^ main.cpp:129:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zeap.out","w",stdout); ^