2 methods in python, beat 95.49%

  • 0

    first, reverse list in place, easy to code but slow, takes about 675ms:

        def constructArray(self, n, k):
            result = range(1, n + 1)
            for i in range(1, k):
                result[i:] = result[:i - 1:-1]
            return result

    second, use deque, takes about 85ms, beat 95%:

        def constructArray2(self, n, k):
            from collections import deque
            src = deque(range(1, n + 1))
            dst = [src.pop() if i % 2 else src.popleft() for i in range(k)]
            if k % 2 == 0:
            return dst

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