Start 2023-12-05 22:37:15

【2024省选前】20231205更正

End 2023-12-31 00:00:00
Contest is over.
Now 2025-12-13 00:25:28

B. 【BJ】T2

Description

Input

Output

Examples

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Output

                            

                        


                        
                                            

                

                                                        

            
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                        Time Limit
                        
                            4 seconds                        
                    

                    

                        Memory Limit
                        512 MB
                    

                    
                

            


            
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