![](https://img.haomeiwen.com/i1350306/08334fd715dc15e0.png)
class Solution {
func climbStairs(_ n: Int) -> Int {
if n == 0||n == 1 {
return n
}
var arr = [Int].init(repeating: 1, count: n + 1)
arr[0] = 1
arr[1] = 1
for i in 2...n{
arr[i] = arr[i - 1] + arr[i - 2];
}
return arr[n];
}
}
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