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This article mainly introduces LeetCode how to arrange the array into the smallest number, the article is very detailed, has a certain reference value, interested friends must read it!

Topic description

Enter an array of non-negative integers, splice all the numbers in the array into a number, and print the smallest of all the numbers that can be concatenated.

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< nums.length str: # 使用map将原数组的数字转成字符串 nums = list(map(str, nums)) def quicksort(l, r): # 经典快速排序实现 if l >

= r:

Return

Pivot = nums [l]

I, j = l, r

While i

< j: # 只需要把这里改成自定义的排序方法即可 while i < j and nums[j] + pivot >

= pivot + nums [j]:

J-= 1

Nums [I] = nums [j]

# just change this to a custom sorting method

While I < j and nums [I] + pivot str:

Class compare (str):

Def _ _ lt__ (self, x):

Return self + x < x + self

# use the key of python's built-in sorted, pass in a class that overloads _ _ lt__, and customize the sorting

Return'. Join (sorted (map (str, nums), key=compare))

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