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feat: add rust solution to lc problem: No.0561

No.0561.Array Partition I

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Lines changed: 18 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -93,6 +93,24 @@ var arrayPairSum = function (nums) {`
`93`	`93`	`};`
`94`	`94`	```
`95`	`95`
	`96`	`+### Rust`
	`97`	`+`
	`98`	+```rust
	`99`	`+impl Solution {`
	`100`	`+ pub fn array_pair_sum(mut nums: Vec<i32>) -> i32 {`
	`101`	`+ nums.sort();`
	`102`	`+ let n = nums.len();`
	`103`	`+ let mut i = 0;`
	`104`	`+ let mut res = 0;`
	`105`	`+ while i < n {`
	`106`	`+ res += nums[i];`
	`107`	`+ i += 2;`
	`108`	`+ }`
	`109`	`+ res`
	`110`	`+ }`
	`111`	`+}`
	`112`	+```
	`113`	`+`
`96`	`114`	`### ...`
`97`	`115`
`98`	`116`	```

Lines changed: 18 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -79,6 +79,24 @@ var arrayPairSum = function (nums) {`
`79`	`79`	`};`
`80`	`80`	```
`81`	`81`
	`82`	`+### Rust`
	`83`	`+`
	`84`	+```rust
	`85`	`+impl Solution {`
	`86`	`+ pub fn array_pair_sum(mut nums: Vec<i32>) -> i32 {`
	`87`	`+ nums.sort();`
	`88`	`+ let n = nums.len();`
	`89`	`+ let mut i = 0;`
	`90`	`+ let mut res = 0;`
	`91`	`+ while i < n {`
	`92`	`+ res += nums[i];`
	`93`	`+ i += 2;`
	`94`	`+ }`
	`95`	`+ res`
	`96`	`+ }`
	`97`	`+}`
	`98`	+```
	`99`	`+`
`82`	`100`	`### ...`
`83`	`101`
`84`	`102`	```

Lines changed: 13 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,13 @@`
	`1`	`+impl Solution {`
	`2`	`+ pub fn array_pair_sum(mut nums: Vec<i32>) -> i32 {`
	`3`	`+ nums.sort();`
	`4`	`+ let n = nums.len();`
	`5`	`+ let mut i = 0;`
	`6`	`+ let mut res = 0;`
	`7`	`+ while i < n {`
	`8`	`+ res += nums[i];`
	`9`	`+ i += 2;`
	`10`	`+ }`
	`11`	`+ res`
	`12`	`+ }`
	`13`	`+}`

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