746. Min Cost Climbing Stairs

skinner 发布于2019-07-30 17:08 / 1979人阅读

746. Min Cost Climbing Stairs

On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed).

Once you pay the cost, you can either climb one or two steps. You need to find minimum cost to reach the top of the floor, and you can either start from the step with index 0, or the step with index 1.
Example:

Input: cost = [10, 15, 20]
Output: 15
Explanation: Cheapest is start on cost[1], pay that cost and go to the top.

Input: cost = [1, 100, 1, 1, 1, 100, 1, 1, 100, 1]
Output: 6
Explanation: Cheapest is start on cost[0], and only step on 1s, skipping cost[3].

Solution:

class Solution:
    def minCostClimbingStairs(self, cost):
        """
        :type cost: List[int]
        :rtype: int
        """
        start_0 = 0
        start_1 = 0
        for each in cost[::-1]:
            old_start_1 = start_1
            start_1 = start_0
            start_0 = min(start_0 + each, old_start_1 + each)
        return min(start_0, start_1)

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