diff --git a/zeta_python/completed/21318.py b/zeta_python/completed/21318.py
new file mode 100644
index 0000000..f8deb67
--- /dev/null
+++ b/zeta_python/completed/21318.py
@@ -0,0 +1,21 @@
+import sys
+
+input = sys.stdin.readline
+
+if __name__ == "__main__":
+    S = [0]
+    N = int(input())
+    D = list(map(int, input().split()))
+    Q = int(input())
+    for i in range(N - 1):
+        if D[i] > D[i + 1]:
+            S.append(S[-1] + 1)
+        else:
+            S.append(S[-1])
+    S.append(S[-1])
+    for _ in range(Q):
+        x, y = map(int, input().split())
+        if x == y:
+            print(0)
+            continue
+        print(S[y - 1] - S[x - 1])