diff --git a/nayeongkim/SWEA/D2/1859.java b/nayeongkim/SWEA/D2/1859.java
new file mode 100644
index 00000000..c5c0c2bb
--- /dev/null
+++ b/nayeongkim/SWEA/D2/1859.java
@@ -0,0 +1,25 @@
+import java.util.Scanner;
+
+class Solution {
+    public static void main(String args[]) throws Exception {
+
+        Scanner sc = new Scanner(System.in);
+        int T;
+        T = sc.nextInt();
+        for (int test_case = 1; test_case <= T; test_case++) {
+            int N = sc.nextInt();
+            int[] arr = new int[N];
+            for (int i = 0; i < N; i++) {
+                arr[i] = sc.nextInt();
+            }
+            int maxValue = arr[N -1];
+            long maxProfit = 0;
+            for (int i = N - 2; i >= 0; i--) {
+                if (maxValue < arr[i]) {
+                    maxValue = arr[i];
+                } else maxProfit += (maxValue - arr[i]);
+            }
+            System.out.println("#" + test_case + " " + maxProfit);
+        }
+    }
+}
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