Given an integer n
, return any array containing n
unique integers such that they add up to 0.
Example 1:
Input: n = 5 Output: [-7,-1,1,3,4] Explanation: These arrays also are accepted [-5,-1,1,2,3] , [-3,-1,2,-2,4].
Example 2:
Input: n = 3 Output: [-1,0,1]
Example 3:
Input: n = 1 Output: [0]
Constraints:
1 <= n <= 1000
Solution: Generation
Use numbers from {-n/2, … n/2} + {0 if n is odd}
Time complexity: O(n)
Space complexity: O(1)
C++
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// Author: Huahua class Solution { public: vector<int> sumZero(int n) { vector<int> ans; for (int i = 1; i <= n / 2; ++i) { ans.push_back(i); ans.push_back(-i); } if (ans.size() != n) ans.push_back(0); return ans; } }; |
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