題目
Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which makes sum of min(ai, bi) for all i from 1 to n as large as possible.
Example 1:
Input: [1,4,3,2]
Output: 4
Explanation: n is 2, and the maximum sum of pairs is 4 = min(1, 2) + min(3, 4).
Note:
n is a positive integer, which is in the range of [1, 10000].
All the integers in the array will be in the range of [-10000, 10000].
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代碼
func arrayPairSum(_ nums: [Int]) -> Int {
guard nums.count % 2 == 0 else {
return 0
}
var arr = nums
arr.sort()
var sum = 0
for i in 0..<arr.count {
if i % 2 == 0 {
sum += arr[i]
}
}
return sum
}
