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Merge pull request youngyangyang04#2104 from fwqaaq/patch-25

Update 0377.组合总和IV.md 优化 rust

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Original file line number	Diff line number	Diff line change
`@@ -269,16 +269,17 @@ Rust`
`269`	`269`	```Rust
`270`	`270`	`impl Solution {`
`271`	`271`	`pub fn combination_sum4(nums: Vec<i32>, target: i32) -> i32 {`
`272`		`- let mut dp = vec![0; target as usize + 1];`
	`272`	`+ let target = target as usize;`
	`273`	`+ let mut dp = vec![0; target + 1];`
`273`	`274`	`dp[0] = 1;`
`274`		`- for i in 1..=target asusize{`
`275`		`- for &j in nums.iter() {`
`276`		`- if i asi32>= j {`
`277`		`- dp[i] += dp[i-j as usize];`
	`275`	`+ for i in 1..=target {`
	`276`	`+ for &n in &nums {`
	`277`	`+ if i >= nasusize {`
	`278`	`+ dp[i] += dp[i-n as usize];`
`278`	`279`	`}`
`279`	`280`	`}`
`280`	`281`	`}`
`281`		`- returndp[targetasusize];`
	`282`	`+ dp[target]`
`282`	`283`	`}`
`283`	`284`	`}`
`284`	`285`	```

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