[20250922] PGM / LV3 / 거스름돈 / 김수연

[20250922] PGM / LV3 / 거스름돈 / 김수연

Author: suyeun84

suyeun84/202509/22 PGM LV3 거스름돈.md

@@ -0,0 +1,22 @@
+```java
+class Solution {
+    public int solution(int n, int[] money) {
+        int answer = 0;
+        final int MOD = 1000000007;
+        int[][] dp = new int[money.length + 1][n + 1];
+        
+        for (int i = 1; i < money.length+1; i++) {
+            for (int j = 0; j <= n; j++) {
+                if (j == 0) {
+                    dp[i][j] = 1;
+                } else if (j - money[i-1] >= 0) {
+                    dp[i][j] = (dp[i - 1][j] + dp[i][j - money[i - 1]]) % MOD;
+                } else
+                    dp[i][j] = dp[i - 1][j];
+            }
+        }
+
+        return dp[money.length][n];
+    }
+}
+```