Start 2025-05-01 12:57:06

【2025省选】20250501模拟赛更正

End 2025-05-31 00:00:00
Contest is over.
Now 2026-04-18 22:56:35

B. 【BJ】T2

Description

Input

Output

Examples

Input


                        

                        

                            
Output

                            

                        


                        
                                            

                

                                                        

            
Submit

            

                                                            

  
Login

  

    

        




        




        

                        Signup        

    
  



                                                

        

        

            

                
                

                    
                    

                        Time Limit
                        
                            4 seconds                        
                    

                    

                        Memory Limit
                        1024 MB
                    

                    
                

            


            
                 Submit