create dev channel

zeta/py/completed/9184.py

@@ -0,0 +1,26 @@
+Mem = [[[None for _ in range(50)] for _ in range(50)] for _ in range(50)]
+
+
+def w(a, b, c):
+    if a <= 0 or b <= 0 or c <= 0:
+        return 1
+    elif Mem[a - 1][b - 1][c - 1] is not None:
+        return Mem[a - 1][b - 1][c - 1]
+    t = 0
+
+    if a > 20 or b > 20 or c > 20:
+        t = w(20, 20, 20)
+    elif a < b < c:
+        t = w(a, b, c - 1) + w(a, b - 1, c - 1) - w(a, b - 1, c)
+    else:
+        t = w(a - 1, b, c) + w(a - 1, b - 1, c) + w(a - 1, b, c - 1) - w(a - 1, b - 1, c - 1)
+
+    Mem[a - 1][b - 1][c - 1] = t
+    return t
+
+
+while True:
+    a, b, c = map(int, input().split())
+    if a == b == c == -1:
+        break
+    print(f"w({a}, {b}, {c}) = {w(a, b, c)}")