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  • P3890
  • Problem
    • P3890XOR和路径
    Limits : Time Limit : - MS   Memory Limit : 165536 KB
    Judgment Tips : 1s
    Description

    Input Format

    如题

    Output Format

    如题

    Sample Input 1

    3 3                            
    1 2 4 
    1 3 5 
    2 3 6 

    Sample Output 1

    4.000

    Sample Input 2

    2 2 
    1 1 2 
    1 2 3 

    Sample Output 2

    2.333

    Source  hnoi2011