Leetcode561.Array Partition I陣列拆分1
給定長度為 2n 的陣列, 你的任務是將這些數分成 n 對, 例如 (a1, b1), (a2, b2), ..., (an, bn) ,使得從1 到 n 的 min(ai, bi) 總和最大。
示例 1:
輸入: [1,4,3,2] 輸出: 4 解釋: n 等於 2, 最大總和為 4 = min(1, 2) + min(3, 4).
提示:
- n 是正整數,範圍在 [1, 10000].
- 陣列中的元素範圍在 [-10000, 10000].
class Solution { public: int arrayPairSum(vector<int>& nums) { int len = nums.size(); sort(nums.begin(), nums.end()); int res = 0; for(int i = 0; i < len; i = i + 2) { res += nums[i]; } return res; } };
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