Problem Statement
Find minimum cost to reach top of stairs.
Approach
dp[i] = cost[i] + min(dp[i-1], dp[i-2]).
Time & Space Complexity
Time O(n), Space O(1).

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Simple DP on stairs.
Find minimum cost to reach top of stairs.
dp[i] = cost[i] + min(dp[i-1], dp[i-2]).
Time O(n), Space O(1).
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