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
