leetcode 912 排序陣列

給定乙個整數陣列 nums，將該陣列公升序排列。

示例 1：

輸入：[5,2,3,1]

輸出：[1,2,3,5]

輸入：[5,1,1,2,0,0]

輸出：[0,0,1,1,2,5]

1 <= a.length <= 10000

-50000 <= a[i] <= 50000

用快排，平均時間複雜度是o(nlogn)，最差的時間複雜度是o(n2)

用歸併，時間複雜度是o(nlogn)

快排：時間》62.34%

空間》100.00%

歸併：時間》70.21%

空間》100.00%

快排：

class

solution
(object):
defsortarray
(self, nums)
:"""
:type nums: list[int]
:rtype: list[int]
"""iflen
(nums)
<=1:
return nums
mid = nums[
len(nums)//2
] nums.remove(mid)
left, right =
,[]for each_num in nums:
if each_num < mid:
else
:return self.sortarray(left)
+[mid]
+ self.sortarray(right)

class

solution
(object):
defsortarray
(self, nums)
:"""
:type nums: list[int]
:rtype: list[int]
"""return self.merge_sort(nums,0,
len(nums)-1
)def
merge
(self, nums, low, mid, high)
: merged_list =
left_p, right_p = low, mid +
1while left_p <= mid and right_p <= high:
if nums[left_p]
< nums[right_p]:)
left_p +=
1else:)
right_p +=
1while left_p <= mid:
) left_p +=
1while right_p <= high:
) right_p +=
1 nums[low:high +1]
= merged_list
defmerge_sort
(self, nums, low, high)
:if low == high:
return nums
mid =
(low + high)//2
self.merge_sort(nums, low, mid)
self.merge_sort(nums, mid +
1, high)
self.merge(nums, low, mid, high)
return nums

class

solution
:def
merge_sorted_lists
(self, nums1:
list
, nums2:
list)-
>
list
: index1, index2 =0,
0 merged_list =
while index1 <
len(nums1)
and index2 <
len(nums2)
:if nums1[index1]
< nums2[index2]:)
index1 +=
1else:)
index2 +=
1if index1 <
len(nums1)
: merged_list += nums1[index1:
]if index2 <
len(nums2)
: merged_list += nums2[index2:
]return merged_list
defsortarray
(self, nums: list[
int])-
> list[
int]:if
len(nums)
<2:
return nums
mid =
len(nums)
>>
1return self.merge_sorted_lists(self.sortarray(nums[
:mid]
), self.sortarray(nums[mid:])
)

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