Section 1Understand Problem
Section 01
Understand the problem
Restate the problem precisely. Interviewers reward candidates who pause, define the contract, and name the guarantees before coding.
Problem statement
You are given an integer array `cost` where `cost[i]` is the cost of the i-th step on a staircase. Once you pay the cost, you can either climb one or two steps. You can either start from the step with index `0`, or the step with index `1`. Return the minimum cost to reach the top of the floor.
Example
cost = [10,15,20] → 15
Constraints
2 ≤ cost.length ≤ 1000 · 0 ≤ cost[i] ≤ 999
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