new file

Author: adityamangal1

Pilling Up.py

@@ -0,0 +1,29 @@
+from collections import deque
+user = int(input())
+while user > 0:
+    t = int(input())
+    l1 = list(map(int, input().split()))
+    t1 = deque(l1)
+    lm = t1.popleft()
+    rm = t1.pop()
+    csv = lm if lm > rm else rm
+    flag = False
+    while len(t1) > 0:
+        if lm >= rm and lm <= csv:
+            csv = lm
+            lm = t1.popleft()
+            latest = lm
+        elif rm >= lm and rm <= csv:
+            csv = rm
+            rm = t1.pop()
+            latest = rm
+        else:
+            flag = True
+            break
+
+    if flag or latest > csv:
+        print('No')
+    else:
+        print('Yes')
+
+    user -= 1