20240324 Finished

src/problem/mod.rs

@@ -83,3 +83,4 @@ mod p1969_minimum_non_zero_product_of_the_array_elements;
 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;

src/problem/p322_coin_change.rs

@@ -0,0 +1,44 @@
+/**
+ * [322] Coin Change
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn coin_change(coins: Vec<i32>, amount: i32) -> i32 {
+        let amount = amount as usize;
+        let mut dp = vec![i32::MAX; amount + 1];
+        dp[0] = 0;
+
+        for i in 1..=amount {
+            for coin in &coins {
+                let coin = *coin as usize;
+                if coin <= i && dp[i - coin] != i32::MAX {
+                    dp[i] = dp[i].min(dp[i - coin] + 1);
+                }
+            }
+        }
+
+        return if dp[amount] == i32::MAX {
+            -1
+        } else {
+            dp[amount]
+        };
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_322() {
+        assert_eq!(3, Solution::coin_change(vec![1,2,5], 11));
+        assert_eq!(-1, Solution::coin_change(vec![2], 3));
+        assert_eq!(0, Solution::coin_change(vec![1], 0));
+    }
+}