Compilare: user.cpp: In function ‘void update(treap*&, int)’: user.cpp:44:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if( nod != NULL ) ^ user.cpp: In function ‘int main()’: user.cpp:146:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:156:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&o,&a,&b,&c); ^