Compilare: user.cpp: In function ‘void propagate(treap*&)’: user.cpp:38:12: warning: unused variable ‘answer’ [-Wunused-variable] treap* answer; ^ user.cpp: In function ‘int main()’: user.cpp:135:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rev.in","r",stdin); ^ user.cpp:136:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rev.out","w",stdout); ^ user.cpp:141:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&q); ^ user.cpp:145:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&a,&b,&k); ^