Start 2026-05-15 12:36:40

【2026NOI】20260512模拟赛更正

End 2026-05-30 00:00:00
Contest is over.
Now 2026-08-24 09:37:18

A. 【BJ】T1

Description

Input

Output

Examples

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Output

                            

                        


                        
                                            

                

                                                        

            
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                        Time Limit
                        
                            4 seconds                        
                    

                    

                        Memory Limit
                        1024 MB
                    

                    
                

            


            
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