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[20221110] solve the easy problem with rust

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🙂easy
- 1920.Build-Array-from-Permutation
  - build-array-from-permutation.rs
- 1929.Concatenation-of-Array
  - concatenation-of-array.rs

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	`1`	`+impl Solution {`
	`2`	`+ pub fn build_array(nums: Vec<i32>) -> Vec<i32> {`
	`3`	`+ let mut result: Vec<i32> = Vec::with_capacity(nums.len());`
	`4`	`+ for i in 0..nums.len() as usize {`
	`5`	`+ result.push(nums[nums[i] as usize]);`
	`6`	`+ }`
	`7`	`+ result`
	`8`	`+ }`
	`9`	`+}`

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	`1`	`+impl Solution {`
	`2`	`+ pub fn get_concatenation(nums: Vec<i32>) -> Vec<i32> {`
	`3`	`+ let mut result = Vec::new();`
	`4`	`+ for i in 0..2 {`
	`5`	`+ for num in &nums {`
	`6`	`+ result.push(*num);`
	`7`	`+ }`
	`8`	`+ }`
	`9`	`+ result`
	`10`	`+ }`
	`11`	`+}`

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