TLE for python solution that should work?

  • 0

    This is my solution and for some reason it shows Time limit exceeded. Can someone tell me what's wrong?

    def climbStairs(n):
        lookup = {1:1, 2:2}
                if n not in lookup:
                    lookup[n] = self.climbStairs(n-1) + self.climbStairs(n-2)    
                return lookup[n]

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