Commit 52684ec

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guangsheng.li01

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`@@ -0,0 +1,55 @@`
	`1`	`+/*`
	`2`	`+ * [0322] coin-change`
	`3`	`+ */`
	`4`	`+`
	`5`	`+pub struct Solution {}`
	`6`	`+`
	`7`	`+use std::cmp::min;`
	`8`	`+use std::collections::HashMap;`
	`9`	`+use std::i32::MAX;`
	`10`	`+impl Solution {`
	`11`	`+ pub fn coin_change(coins: Vec<i32>, amount: i32) -> i32 {`
	`12`	`+ if amount == 0 {`
	`13`	`+ return 0;`
	`14`	`+ }`
	`15`	`+ let mut dp: HashMap<i32, i32> = HashMap::new();`
	`16`	`+ Self::dfs(&coins, amount, &mut dp)`
	`17`	`+ }`
	`18`	`+`
	`19`	`+ fn dfs(coins: &Vec<i32>, amount: i32, dp: &mut HashMap<i32, i32>) -> i32 {`
	`20`	`+ if amount <= 0 {`
	`21`	`+ return -1;`
	`22`	`+ }`
	`23`	`+ if let Some(r) = dp.get(&amount) {`
	`24`	`+ return *r;`
	`25`	`+ }`
	`26`	`+`
	`27`	`+ for i in coins {`
	`28`	`+ if *i == amount {`
	`29`	`+ return 1;`
	`30`	`+ }`
	`31`	`+ }`
	`32`	`+`
	`33`	`+ let mut result = MAX;`
	`34`	`+ for i in (0..coins.len()).rev() {`
	`35`	`+ let j = Self::dfs(coins, amount - coins[coins.len() - i - 1], dp);`
	`36`	`+ if j != -1 {`
	`37`	`+ result = min(result, j + 1)`
	`38`	`+ }`
	`39`	`+ }`
	`40`	`+ result = if result == MAX { -1 } else { result };`
	`41`	`+ dp.insert(amount, result);`
	`42`	`+ result`
	`43`	`+ }`
	`44`	`+}`
	`45`	`+`
	`46`	`+#[cfg(test)]`
	`47`	`+mod tests {`
	`48`	`+ use super::*;`
	`49`	`+`
	`50`	`+ #[test]`
	`51`	`+ fn test_case0() {`
	`52`	`+ assert_eq!(Solution::coin_change(vec![1, 2, 5], 11), 3);`
	`53`	`+ assert_eq!(Solution::coin_change(vec![2], 3), -1);`
	`54`	`+ }`
	`55`	`+}`

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Original file line number	Diff line number	Diff line change
`@@ -20,6 +20,7 @@ mod a0118_pascals_triangle;`
`20`	`20`	`mod a0119_pascals_triangle_ii;`
`21`	`21`	`mod a0145_binary_tree_postorder_traversal;`
`22`	`22`	`mod a0172_factorial_trailing_zeroes;`
	`23`	`+mod a0322_coin_change;`
`23`	`24`	`mod a0392_is_subsequence;`
`24`	`25`	`mod a0400_nth_digit;`
`25`	`26`	`mod a0404_sum_of_left_leaves;`

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