Commit 500ae42

committed

coin change 2

1 parent 4005d49 commit 500ae42Copy full SHA for 500ae42

File tree

+33

-1

lines changed

+33

-1

lines changed

Lines changed: 32 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,32 @@`
	`1`	`+use std::collections::HashMap;`
	`2`	`+pub struct Solution {}`
	`3`	`+impl Solution {`
	`4`	`+ pub fn change(amount: i32, coins: Vec<i32>) -> i32 {`
	`5`	`+ let mut mem: HashMap<(usize, i32), i32> = HashMap::new();`
	`6`	`+ Self::dfs(0, 0, amount, &coins, &mut mem)`
	`7`	`+ }`
	`8`	`+`
	`9`	`+ fn dfs(`
	`10`	`+ sum: i32,`
	`11`	`+ i: usize,`
	`12`	`+ amount: i32,`
	`13`	`+ coins: &Vec<i32>,`
	`14`	`+ mem: &mut HashMap<(usize, i32), i32>,`
	`15`	`+ ) -> i32 {`
	`16`	`+ if sum > amount \|\| i >= coins.len() {`
	`17`	`+ return 0;`
	`18`	`+ }`
	`19`	`+`
	`20`	`+ if sum == amount {`
	`21`	`+ return 1;`
	`22`	`+ }`
	`23`	`+`
	`24`	`+ if let Some(val) = mem.get(&(i, sum)) {`
	`25`	`+ return *val;`
	`26`	`+ }`
	`27`	`+ let val = Self::dfs(sum + coins[i], i, amount, coins, mem)`
	`28`	`+ + Self::dfs(sum, i + 1, amount, coins, mem);`
	`29`	`+ mem.insert((i, sum), val);`
	`30`	`+ val`
	`31`	`+ }`
	`32`	`+}`

Lines changed: 1 addition & 1 deletion

Comments

(0)