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solve: 279. Perfect Squares in rustlang

Signed-off-by: rajput-hemant <rajput.hemant2001@gmail.com>

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	`1`	`+use std::cmp::min;`
	`2`	`+`
	`3`	`+impl Solution {`
	`4`	`+ pub fn num_squares(n: i32) -> i32 {`
	`5`	`+ // make a dp array of size n + 1 and filled with 0`
	`6`	`+ let mut dp = vec![n; n as usize + 1];`
	`7`	`+`
	`8`	`+ // set the first element to 0`
	`9`	`+ dp[0] = 0;`
	`10`	`+`
	`11`	`+ // iterate from 1 to n`
	`12`	`+ for i in 1..=n as usize {`
	`13`	`+ // iterate from 1 to sqrt(i)`
	`14`	`+ for j in 1..=(i as f64).sqrt() as usize {`
	`15`	`+ // set dp[i] to the minimum of dp[i] and dp[i - j * j] + 1`
	`16`	`+ dp[i] = min(dp[i], dp[i - j * j] + 1);`
	`17`	`+ }`
	`18`	`+ }`
	`19`	`+`
	`20`	`+ dp[n as usize]`
	`21`	`+ }`
	`22`	`+}`

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