You are climbing a stair case.It takes steps number of steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?Note: Given argument `steps` will be a positive integer."" # O(n) space def climb_stairs(steps): """:type steps: int :rtype: int arr = [1, 1] for _in range(1, steps): arr.append(arr[-1] + arr[-2]) return arr[-1] # the above function can be optimized as:# 0(1) space def climb_stairs_optimized(steps): ""'"' :type steps: int :rtype: int a_steps = b_steps = 1 for in range(steps): a_steps, b_steps = b_steps, a_steps + b_steps —

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