Problem: 70. 爬楼梯

复杂度

时间复杂度: $O(n)$

Code

class Solution {
	public int climbStairs(int n)
	{
		int[] f = new int[n + 1];
		f[0] = 1;
		f[1] = 1;
		for (int i = 2; i <= n; i++)
			f[i] = f[i - 1] + f[i - 2];

		return f[n];
	}
}