create dev channel

zeta/py/completed/11509.py

@@ -0,0 +1,17 @@
+def solve(N, H):
+    lasts = []
+    for i, h in enumerate(H):
+        for j, l in enumerate(lasts):
+            if h == l - 1:
+                lasts[j] -= 1
+                break
+        else:
+            lasts.append(h)
+
+    return len(lasts)
+
+
+if __name__ == '__main__':
+    N = int(input())
+    H = list(map(int, input().split()))
+    print(solve(N, H))