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authorJack Sangdahl <jack@pngu.org>2024-07-03 12:30:09 -0600
committerJack Sangdahl <jack@pngu.org>2024-07-03 12:30:09 -0600
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parent318d09b755ea3fafd3dc75485dd9387ae777135c (diff)
downloadleetcode-d9929fb2bd46e35c3372a26194e869b0cb078bf4.tar.gz
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2110. number smooth descent periods of stock
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+# 2110. Number of Smooth Descent Periods of a Stock
+
+"""
+you are given an integer array 'prices' representing the daily price history
+of a stock where 'prices[i]' is the stock price on the i'th day. a smooth
+descent period of a stock consists of one or more contiguous days such that
+the price on each day is lower than the price on the peceding day by
+exactly 1. the first day of the period is exempted from this rule. return the
+number of smooth descent periods.
+"""
+
+
+class Solution(object):
+ def getDescentPeriods(self, prices):
+ """
+ :type prices: List[int]
+ :rtype: int
+ """
+ dp = [1] * len(prices)
+ for i in range(1, len(prices)):
+ if prices[i] == prices[i - 1] - 1:
+ dp[i] += dp[i - 1]
+ return sum(dp)
+
+
+if __name__ == "__main__":
+ obj = Solution()
+ print(obj.getDescentPeriods(prices=[3, 2, 1, 4]))
+ print(obj.getDescentPeriods(prices=[8, 6, 7, 7]))
+ print(obj.getDescentPeriods(prices=[1]))