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feat: add rust solution to lc problem: No.2574 (doocs#1203)

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solution/2500-2599/2574.Left and Right Sum Differences
- README.md
- README_EN.md

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Original file line number	Diff line number	Diff line change
`@@ -196,6 +196,49 @@ impl Solution {`
`196`	`196`	`}`
`197`	`197`	```
`198`	`198`
	`199`	+```rust
	`200`	`+impl Solution {`
	`201`	`+ pub fn left_right_difference(nums: Vec<i32>) -> Vec<i32> {`
	`202`	`+ let mut ans = vec![];`
	`203`	`+`
	`204`	`+ for i in 0..nums.len() {`
	`205`	`+`
	`206`	`+ let mut left = 0;`
	`207`	`+ for j in 0..i {`
	`208`	`+ left += nums[j];`
	`209`	`+ }`
	`210`	`+`
	`211`	`+ let mut right = 0;`
	`212`	`+ for k in i + 1..nums.len() {`
	`213`	`+ right += nums[k];`
	`214`	`+ }`
	`215`	`+`
	`216`	`+ ans.push((left - right).abs());`
	`217`	`+ }`
	`218`	`+`
	`219`	`+ ans`
	`220`	`+ }`
	`221`	`+}`
	`222`	+```
	`223`	`+`
	`224`	+```rust
	`225`	`+impl Solution {`
	`226`	`+ pub fn left_right_difference(nums: Vec<i32>) -> Vec<i32> {`
	`227`	`+ let mut left = 0;`
	`228`	`+ let mut right: i32 = nums.iter().sum();`
	`229`	`+ let mut ans = vec![];`
	`230`	`+`
	`231`	`+ for &x in &nums {`
	`232`	`+ right -= x;`
	`233`	`+ ans.push((left - right).abs());`
	`234`	`+ left += x;`
	`235`	`+ }`
	`236`	`+`
	`237`	`+ ans`
	`238`	`+ }`
	`239`	`+}`
	`240`	+```
	`241`	`+`
`199`	`242`	`### C`
`200`	`243`
`201`	`244`	```c

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Original file line number	Diff line number	Diff line change
`@@ -173,6 +173,49 @@ impl Solution {`
`173`	`173`	`}`
`174`	`174`	```
`175`	`175`
	`176`	+```rust
	`177`	`+impl Solution {`
	`178`	`+ pub fn left_right_difference(nums: Vec<i32>) -> Vec<i32> {`
	`179`	`+ let mut ans = vec![];`
	`180`	`+`
	`181`	`+ for i in 0..nums.len() {`
	`182`	`+`
	`183`	`+ let mut left = 0;`
	`184`	`+ for j in 0..i {`
	`185`	`+ left += nums[j];`
	`186`	`+ }`
	`187`	`+`
	`188`	`+ let mut right = 0;`
	`189`	`+ for k in i + 1..nums.len() {`
	`190`	`+ right += nums[k];`
	`191`	`+ }`
	`192`	`+`
	`193`	`+ ans.push((left - right).abs());`
	`194`	`+ }`
	`195`	`+`
	`196`	`+ ans`
	`197`	`+ }`
	`198`	`+}`
	`199`	+```
	`200`	`+`
	`201`	+```rust
	`202`	`+impl Solution {`
	`203`	`+ pub fn left_right_difference(nums: Vec<i32>) -> Vec<i32> {`
	`204`	`+ let mut left = 0;`
	`205`	`+ let mut right: i32 = nums.iter().sum();`
	`206`	`+ let mut ans = vec![];`
	`207`	`+`
	`208`	`+ for &x in &nums {`
	`209`	`+ right -= x;`
	`210`	`+ ans.push((left - right).abs());`
	`211`	`+ left += x;`
	`212`	`+ }`
	`213`	`+`
	`214`	`+ ans`
	`215`	`+ }`
	`216`	`+}`
	`217`	+```
	`218`	`+`
`176`	`219`	`### C`
`177`	`220`
`178`	`221`	```c

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