Python3 提交这段代码过了,PyPy3 却 T 了 import sys from functools import lru_cache input = sys.stdin.readline MOD = 10 ** 9 + 7 @lru_cache(None) def F(a, b, c): if a <= 0 or b <= 0 or c <= 0: return 1 if a < b and b < c: return (F(a, b, c - 1) + F(a, b - 1, c - 1) - F(a, b - 1, c)) % MOD return ...