Given an array A
of integers,we must modify the array in the following way: we choose an i
and replace A[i]
with -A[i]
,and we repeat this process K
times in total. (We may choose the same index i
multiple times.)
Return the largest possible sum of the array after modifying it in this way.
Example 1:
input: A = [4,2,3],K = 1 Output: 5 Explanation: Choose indices (1,) and A becomes [4,-2,3].
Example 2:
input: A = [3,-1,2],K = 3 Output: 6 Explanation: Choose indices (1,2) and A becomes [3,1,2].
Example 3:
input: A = [2,-3,5,-4],K = 2 Output: 13 Explanation: Choose indices (1,4) and A becomes [2,3,4].
Note:
1 <= A.length <= 10000
1 <= K <= 10000
-100 <= A[i] <= 100
给定一个整数数组 A,我们只能用以下方法修改该数组:我们选择某个个索引 i
并将 A[i]
替换为 -A[i]
,然后总共重复这个过程 K
次。(我们可以多次选择同一个索引 i
。)
以这种方式修改数组后,返回数组可能的最大和。
示例 1:
输入:A = [4,K = 1输出:5解释:选择索引 (1,) ,然后 A 变为 [4,3]。
示例 2:
输入:A = [3,K = 3输出:6解释:选择索引 (1,2) ,然后 A 变为 [3,2]。
示例 3:
输入:A = [2,K = 2输出:13解释:选择索引 (1,4) ,然后 A 变为 [2,4]。
提示:
1 <= A.length <= 10000
1 <= K <= 10000
-100 <= A[i] <= 100
Runtime: 44 ms Memory Usage: 19.1 MB 1 class Solution { 2 func largestSumAfterKNegations(_ A: [Int],_ K: Int) -> Int { 3 var A = A 4 var K = K 5 A.sort() 6 for i in 0..<A.count 7 { 8 if K > 0 && A[i] < 0 9 {10 A[i] = -A[i]11 K -= 1 12 }13 }14 A.sort()15 if K % 2 == 116 {17 A[0] = -A[0]18 }19 var ret:Int = 020 for a in A21 {22 ret += a 23 }24 return ret25 }26 }总结
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