帖子from math import gcd

from math import gcd def is_coprime(a, b): return gcd(a, b) == 1 def solve (N, A): dp = [1] * N for i in range(1, N): for j in range(i): if A[i] > A[j] and not is_coprime(A[i], A[j]): dp[i] = max(dp[i], dp[j] + 1) return max(dp) Done ✅