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Diffstat (limited to 'beautiful_arrangement2.py')
-rw-r--r-- | beautiful_arrangement2.py | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/beautiful_arrangement2.py b/beautiful_arrangement2.py new file mode 100644 index 0000000..9bdfd1a --- /dev/null +++ b/beautiful_arrangement2.py @@ -0,0 +1,36 @@ +# 667. Beautiful Arrangement II + +""" +given two integers 'n' and 'k', construct a list 'answer' that contains 'n' +different positive integers ranging from 1 to 'n' and obeys the following +requirement: suppose this list is 'answer = [a1, a2, a3, ..., an]', the the +list '[a1 - a2, a2 - a3, ..., an-1 - an]' has exactly 'k' distinct integers. +return the list 'answer'. if there are multiple valid answers, return any of +them. +""" + + +class Solution(object): + def constructArray(self, n, k): + """ + :type n: int + :type k: int + :rtype: List[int] + """ + ans, left, right = [0] * n, 1, k + 1 + for i in range(k + 1): + if i & 1: + ans[i] = right + right -= 1 + else: + ans[i] = left + left += 1 + for i in range(k + 1, n): + ans[i] = i + 1 + return ans + + +if __name__ == "__main__": + obj = Solution() + print(obj.constructArray(3, 1)) + print(obj.constructArray(3, 2)) |