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feat: add rust solution to lc problem: No.0724 (#1621)

No.0724.Find Pivot Index

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Lines changed: 18 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -191,6 +191,24 @@ function pivotIndex(nums: number[]): number {`
`191`	`191`	`}`
`192`	`192`	```
`193`	`193`
	`194`	`+### Rust`
	`195`	`+`
	`196`	+```rust
	`197`	`+impl Solution {`
	`198`	`+ pub fn pivot_index(nums: Vec<i32>) -> i32 {`
	`199`	`+ let (mut left, mut right): (i32, i32) = (0, nums.iter().sum());`
	`200`	`+ for i in 0..nums.len() {`
	`201`	`+ right -= nums[i];`
	`202`	`+ if left == right {`
	`203`	`+ return i as i32;`
	`204`	`+ }`
	`205`	`+ left += nums[i];`
	`206`	`+ }`
	`207`	`+ -1`
	`208`	`+ }`
	`209`	`+}`
	`210`	+```
	`211`	`+`
`194`	`212`	`### ...`
`195`	`213`
`196`	`214`	```

Lines changed: 18 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -166,6 +166,24 @@ function pivotIndex(nums: number[]): number {`
`166`	`166`	`}`
`167`	`167`	```
`168`	`168`
	`169`	`+### Rust`
	`170`	`+`
	`171`	+```rust
	`172`	`+impl Solution {`
	`173`	`+ pub fn pivot_index(nums: Vec<i32>) -> i32 {`
	`174`	`+ let (mut left, mut right): (i32, i32) = (0, nums.iter().sum());`
	`175`	`+ for i in 0..nums.len() {`
	`176`	`+ right -= nums[i];`
	`177`	`+ if left == right {`
	`178`	`+ return i as i32;`
	`179`	`+ }`
	`180`	`+ left += nums[i];`
	`181`	`+ }`
	`182`	`+ -1`
	`183`	`+ }`
	`184`	`+}`
	`185`	+```
	`186`	`+`
`169`	`187`	`### ...`
`170`	`188`
`171`	`189`	```

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 pivot_index(nums: Vec<i32>) -> i32 {`
	`3`	`+ let (mut left, mut right): (i32, i32) = (0, nums.iter().sum());`
	`4`	`+ for i in 0..nums.len() {`
	`5`	`+ right -= nums[i];`
	`6`	`+ if left == right {`
	`7`	`+ return i as i32;`
	`8`	`+ }`
	`9`	`+ left += nums[i];`
	`10`	`+ }`
	`11`	`+ -1`
	`12`	`+ }`
	`13`	`+}`

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