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docs: sync problem 15 with original content from leetcoder.net

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en/1-1000
- 15-3sum.md
zh/1-1000
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`‎en/1-1000/15-3sum.md`

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Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,7 @@`
`1`		`-#15. 3Sum - Best Practices of LeetCode Solutions`
`2`		`-LeetCode link:[15. 3Sum](https://leetcode.com/problems/3sum), difficulty:Medium`
	`1`	`+Original link:[leetcoder.net - LeetCoder: Fucking Good LeetCode Solutions](https://leetcoder.net/en/leetcode/15-3sum)`
	`2`	`+`
	`3`	`+#15. 3Sum - LeetCoder: Fucking Good LeetCode Solutions`
	`4`	`+LeetCode link:[15. 3Sum](https://leetcode.com/problems/3sum), Difficulty:Medium.`
`3`	`5`
`4`	`6`	`##LeetCode description of "15. 3Sum"`
`5`	`7`	Given an integer array nums, return all the triplets`[nums[i], nums[j], nums[k]]` such that`i != j`,`i != k`, and`j != k`, and`nums[i] + nums[j] + nums[k] == 0`.
`@@ -85,8 +87,8 @@ Notice that the order of the output and the order of the triplets does not matte`
`85`	`87`	```
`86`	`88`
`87`	`89`	`## Complexity`
`88`		-* Time:`O(N * N)`.
`89`		-* Space:`O(N)`.
	`90`	+- Time complexity:`O(N * N)`.
	`91`	+- Space complexity:`O(N)`.
`90`	`92`
`91`	`93`	`## Python`
`92`	`94`	`### Solution1: UseMap (complex and slow)`
`@@ -164,37 +166,7 @@ class Solution:`
`164`	`166`	`return list(results)`
`165`	`167`	```
`166`	`168`
`167`		`-##C++`
`168`		-```cpp
`169`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`170`		-```
`171`		`-`
`172`		`-## Java`
	`169`	`+## Other languages`
`173`	`170`	```java
`174`	`171`	`// Welcome to create a PR to complete the code of this language, thanks!`
`175`	`172`	```
`176`		`-`
`177`		`-## JavaScript`
`178`		-```javascript
`179`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`180`		-```
`181`		`-`
`182`		`-##C#`
`183`		-```c#
`184`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`185`		-```
`186`		`-`
`187`		`-## Go`
`188`		-```go
`189`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`190`		-```
`191`		`-`
`192`		`-## Ruby`
`193`		-```ruby
`194`		`-# Welcome to create a PR to complete the code of this language, thanks!`
`195`		-```
`196`		`-`
`197`		`-##C, Kotlin, Swift, Rust or other languages`
`198`		-```
`199`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`200`		-```

`‎zh/1-1000/15-3sum.md`

Lines changed: 6 additions & 34 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,7 +1,9 @@`
	`1`	`+原文链接：[leetcoder.net - 力扣题解最佳实践](https://leetcoder.net/zh/leetcode/15-3sum)`
	`2`	`+`
`1`	`3`	`#15. 三数之和 - 力扣题解最佳实践`
`2`	`4`	`力扣链接：[15. 三数之和](https://leetcode.cn/problems/3sum) ，难度：中等。`
`3`	`5`
`4`		`-##力扣“15. 三数之和”问题描述`
	`6`	`+##力扣"15. 三数之和"问题描述`
`5`	`7`	给你一个整数数组`nums` ，判断是否存在三元组`[nums[i], nums[j], nums[k]]` 满足`i != j`、`i != k` 且`j != k` ，同时还满足`nums[i] + nums[j] + nums[k] == 0` 。请你返回所有和为`0` 且不重复的三元组。
`6`	`8`
`7`	`9`	`注意：答案中不可以包含重复的三元组。`
`@@ -82,8 +84,8 @@ nums[0] + nums[3] + nums[4] = (-1) + 2 + (-1) = 0 。`
`82`	`84`	```
`83`	`85`
`84`	`86`	`## 复杂度`
`85`		-* 时间：`O(N * N)`。
`86`		-* 空间：`O(N)`。
	`87`	+- 时间：`O(N * N)`。
	`88`	+- 空间：`O(N)`。
`87`	`89`
`88`	`90`	`## Python`
`89`	`91`	`### Solution1: UseMap (complex and slow)`
`@@ -160,37 +162,7 @@ class Solution:`
`160`	`162`	`return list(results)`
`161`	`163`	```
`162`	`164`
`163`		`-##C++`
`164`		-```cpp
`165`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`166`		-```
`167`		`-`
`168`		`-## Java`
	`165`	`+## 其他语言`
`169`	`166`	```java
`170`	`167`	`// Welcome to create a PR to complete the code of this language, thanks!`
`171`	`168`	```
`172`		`-`
`173`		`-## JavaScript`
`174`		-```javascript
`175`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`176`		-```
`177`		`-`
`178`		`-##C#`
`179`		-```c#
`180`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`181`		-```
`182`		`-`
`183`		`-## Go`
`184`		-```go
`185`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`186`		-```
`187`		`-`
`188`		`-## Ruby`
`189`		-```ruby
`190`		`-# Welcome to create a PR to complete the code of this language, thanks!`
`191`		-```
`192`		`-`
`193`		`-##C, Kotlin, Swift, Rust or other languages`
`194`		-```
`195`		`-// Welcome to create a PR to complete the code of this language, thanks!`
`196`		-```

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`‎en/1-1000/15-3sum.md`

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