最水的一集，20min写完了四道半，盯第四题盯了40min没思路在1h的时候就直接交了 第一题 签到中的签到，没什么好说的 n = int(input()) a = list(map(int, input().split())) ok = 1 b = [] for i in range(n - 1): b.append(a[i + 1] - a[i]) for i in range(n - 1): if a[i + 1] <= a[i]: ok = 0 break for i in range(n - 2): if b[i + 1] >= b[i]: ok = 0 break print("Yes" if ok else "No") 第二题 签中签 n, m = map(int, input().split()) s = "meituan" now = 0 a = [] for i in range(n): a.append(input()) for i in range(n): if s[now] in a[i]: now += 1 if now == 7: break print("YES" if now == 7 else "NO")