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feat: add solutions to lc problem: No.0138 (doocs#3903)

No.0138.Copy List with Random Pointer

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Original file line number	Diff line number	Diff line change
`@@ -250,26 +250,4 @@ class Solution {`
`250`	`250`
`251`	`251`	`<!-- solution:end -->`
`252`	`252`
`253`		`-<!-- solution:start -->`
`254`		`-`
`255`		`-### 方法二`
`256`		`-`
`257`		`-<!-- tabs:start -->`
`258`		`-`
`259`		`-#### C++`
`260`		`-`
`261`		-```cpp
`262`		`-class Solution {`
`263`		`-public:`
`264`		`- int removeDuplicates(vector<int>& nums) {`
`265`		`- nums.erase(unique(nums.begin(), nums.end()), nums.end());`
`266`		`- return nums.size();`
`267`		`- }`
`268`		`-};`
`269`		-```
`270`		`-`
`271`		`-<!-- tabs:end -->`
`272`		`-`
`273`		`-<!-- solution:end -->`
`274`		`-`
`275`	`253`	`<!-- problem:end -->`

Lines changed: 0 additions & 22 deletions

Original file line number	Diff line number	Diff line change
`@@ -251,26 +251,4 @@ class Solution {`
`251`	`251`
`252`	`252`	`<!-- solution:end -->`
`253`	`253`
`254`		`-<!-- solution:start -->`
`255`		`-`
`256`		`-### Solution 2`
`257`		`-`
`258`		`-<!-- tabs:start -->`
`259`		`-`
`260`		`-#### C++`
`261`		`-`
`262`		-```cpp
`263`		`-class Solution {`
`264`		`-public:`
`265`		`- int removeDuplicates(vector<int>& nums) {`
`266`		`- nums.erase(unique(nums.begin(), nums.end()), nums.end());`
`267`		`- return nums.size();`
`268`		`- }`
`269`		`-};`
`270`		-```
`271`		`-`
`272`		`-<!-- tabs:end -->`
`273`		`-`
`274`		`-<!-- solution:end -->`
`275`		`-`
`276`	`254`	`<!-- problem:end -->`