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Ason93
Algorithm
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Algorithm
/
sort_algorithm
/
insertion_sort
/
main.cpp
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38 lines (35 loc) · 1.35 KB
master
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Algorithm
/
sort_algorithm
/
insertion_sort
/
main.cpp
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#
include
<
stdio.h
>
//
分类 ------------- 内部比较排序
//
数据结构 ---------- 数组
//
最差时间复杂度 ---- 最坏情况为输入序列是降序排列的,此时时间复杂度O(n^2)
//
最优时间复杂度 ---- 最好情况为输入序列是升序排列的,此时时间复杂度O(n)
//
平均时间复杂度 ---- O(n^2)
//
所需辅助空间 ------ O(1)
//
稳定性 ------------ 稳定
void
InsertionSort
(
int
A[],
int
n)
{
for
(
int
i =
1
; i < n; i++)
//
类似抓扑克牌排序
{
int
get = A[i];
//
右手抓到一张扑克牌
int
j = i -
1
;
//
拿在左手上的牌总是排序好的
while
(j >=
0
&& A[j] > get)
//
将抓到的牌与手牌从右向左进行比较
{
A[j +
1
] = A[j];
//
如果该手牌比抓到的牌大,就将其右移
j--;
}
A[j +
1
] = get;
//
直到该手牌比抓到的牌小(或二者相等),将抓到的牌插入到该手牌右边(相等元素的相对次序未变,所以插入排序是稳定的)
}
}
int
main
()
{
int
A[] = {
6
,
5
,
3
,
1
,
8
,
7
,
2
,
4
};
//
从小到大插入排序
int
n =
sizeof
(A) /
sizeof
(
int
);
InsertionSort
(A, n);
printf
(
"
插入排序结果:
"
);
for
(
int
i =
0
; i < n; i++)
{
printf
(
"
%d
"
, A[i]);
}
printf
(
"
\n
"
);
return
0
;
}
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