diff --git a/swea/1859.py b/swea/1859.py
new file mode 100644
index 0000000..b8fb1dc
--- /dev/null
+++ b/swea/1859.py
@@ -0,0 +1,14 @@
+t=int(input())
+
+for tc in range(1,t+1):
+    n=int(input())
+    arr=list(map(int,input().split()))
+
+    mx=0
+    r=0
+    for i in range(1,n+1):
+        if arr[-i]>mx:
+            mx=arr[-i]
+        else:
+            r+=mx-arr[-i]
+    print("#"+str(tc),r)