4698: P9428 [蓝桥杯 2023 国 B] 逃跑

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

Input

Output

Sample Input Copy

4 1 0.2
1 2
2 3
3 4
2

Sample Output Copy

1.30

HINT