20240325 Finished

src/problem/mod.rs

@@ -84,3 +84,4 @@ mod p2671_frequency_tracker;
 mod p2617_minimum_number_of_visited_cells_in_a_grid;
 mod p2549_count_distinct_numbers_on_board;
 mod p322_coin_change;
+mod p518_coin_change_ii;

src/problem/p518_coin_change_ii.rs

@@ -0,0 +1,39 @@
+/**
+ * [518] Coin Change II
+ */
+pub struct Solution {}
+
+// submission codes start here
+
+impl Solution {
+    pub fn change(amount: i32, coins: Vec<i32>) -> i32 {
+        let amount = amount as usize;
+
+        let mut dp = vec![0; amount + 1];
+        dp[0] = 1;
+
+        for coin in &coins {
+            let coin = *coin as usize;
+
+            for i in coin..=amount {
+                dp[i] += dp[i - coin];
+            }
+        }
+
+        dp[amount]
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_518() {
+        assert_eq!(4, Solution::change(5, vec![1, 2, 5]));
+        assert_eq!(0, Solution::change(3, vec![2]));
+        assert_eq!(1, Solution::change(10, vec![10]));
+    }
+}