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Merge Sort

AOJ 站点默认 11个月前 (04-11) 728次浏览 已收录 57个评论
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Question

Write a program of a Merge Sort algorithm implemented by the following pseudocode. You should also report the number of comparisons in the Merge function.

Input
In the first line n is given. In the second line, n integers are given.

Output
In the first line, print the sequence S. Two consequtive elements should be separated by a space character.

In the second line, print the number of comparisons.

Constraints
n ≤ 500000
0 ≤ an element in S ≤ 109
Sample Input 1
10
8 5 9 2 6 3 7 1 10 4
Sample Output 1
1 2 3 4 5 6 7 8 9 10
34

Meaning


实现归并排序,除了输出排序后的数组,下一行输出归并排序在比较过程中的次数

Sloution

归并排序利用了分治的思想,首先先分,给数组全部对半分开,分开后分到不能再分,这时候需要合并,写一个合并函数将其合并

Coding

Summary


归并排序的总体复杂度为0(nlogn)

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