diff --git a/zeta_python/completed/10431.py b/zeta_python/completed/10431.py
new file mode 100644
index 0000000..baa2330
--- /dev/null
+++ b/zeta_python/completed/10431.py
@@ -0,0 +1,28 @@
+import sys
+
+input = sys.stdin.readline
+
+
+def solve(A: list[int]):
+    A.reverse()
+    B = []
+    cnt = 0
+    while A:
+        a = A.pop()
+        l = len(B)
+        for i, b in enumerate(B):
+            if b > a:
+                B.insert(i, a)
+                cnt += l - i
+                break
+        else:
+            B.append(a)
+
+    return cnt
+
+
+if __name__ == "__main__":
+    T = int(input())
+    for _ in range(T):
+        t, *A = map(int, input().split())
+        print(t, solve(A))