Kick Start 2020 Round C [1] Countdown
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描述:
一个数字数组,给定k,记录出现[k, k-1, …, 1]的连续子数组的次数。
思路:
记录数字减小的长度,如果出现了1且计数大于目标长度,表示一个出现。
def kcountdown(nums, k):
decrease_count, count = 0, 0
for i in range(1, len(nums)):
if nums[i] == nums[i - 1] + 1:
decrease_count += 1
else:
decrease_count = 0
if nums[i] == 1 and decrease_count >= k - 1:
count += 1
return count