Start 2026-01-10 14:24:03

【2026NOIP】20260110模拟赛更正

End 2026-01-31 00:00:00
Contest is over.
Now 2026-03-28 19:39:44

D. 【S】T4

Description

Input

Output

Examples

Input


                        

                        

                            
Output

                            

                        


                        
                                            

                

                                                        

            
Submit

            

                                                            

  
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                        Time Limit
                        
                            2 seconds                        
                    

                    

                        Memory Limit
                        512 MB
                    

                    
                

            


            
                 Submit