5159: P8681 [蓝桥杯 2019 省 AB] 完全二叉树的权值

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

Description

Input

Output

Sample Input Copy

7
1 6 5 4 3 2 1

Sample Output Copy

2

HINT