sql最后没时间没做出来，也是用的分类汇总casewhen+sum，哭了 编程第一题：就是求排列组合， 1：n = int(input().strip(" ")) res = 1 i = 0 while i<3: res *= n i += 1 n -=1 2:力扣原题：吃蛋糕的koko，唯一需要注意的是题目给的输入，是字符串需要处理一下，一开始没注意 class Solution: def mineatSpeed(self, plate, H): max_speed = max(plate) left, right = 1, max_speed while left < right: mid = left + (right - left) // 2 if self.helper(mid, H, plate): right = mid else: left = mid + 1 return left def helper(self, speed, H, plate): hours = 0 for i in range(len(plate)): hours += plate[i] // speed if plate[i] % speed == 0 else plate[i] // speed + 1 if hours > H: return False else: return True