{ "data": { "question": { "questionId": "3847", "questionFrontendId": "3551", "categoryTitle": "Algorithms", "boundTopicId": 3677777, "title": "Minimum Swaps to Sort by Digit Sum", "titleSlug": "minimum-swaps-to-sort-by-digit-sum", "content": "
You are given an array nums
of distinct positive integers. You need to sort the array in increasing order based on the sum of the digits of each number. If two numbers have the same digit sum, the smaller number appears first in the sorted order.
Return the minimum number of swaps required to rearrange nums
into this sorted order.
A swap is defined as exchanging the values at two distinct positions in the array.
\n\n\n
Example 1:
\n\nInput: nums = [37,100]
\n\nOutput: 1
\n\nExplanation:
\n\n[3 + 7 = 10, 1 + 0 + 0 = 1] → [10, 1]
[100, 37]
. Swap 37
with 100
to obtain the sorted order.nums
is 1.Example 2:
\n\nInput: nums = [22,14,33,7]
\n\nOutput: 0
\n\nExplanation:
\n\n[2 + 2 = 4, 1 + 4 = 5, 3 + 3 = 6, 7 = 7] → [4, 5, 6, 7]
[22, 14, 33, 7]
. The array is already sorted.nums
is 0.Example 3:
\n\nInput: nums = [18,43,34,16]
\n\nOutput: 2
\n\nExplanation:
\n\n[1 + 8 = 9, 4 + 3 = 7, 3 + 4 = 7, 1 + 6 = 7] → [9, 7, 7, 7]
[16, 34, 43, 18]
. Swap 18
with 16
, and swap 43
with 34
to obtain the sorted order.nums
is 2.\n
Constraints:
\n\n1 <= nums.length <= 105
1 <= nums[i] <= 109
nums
consists of distinct positive integers.给你一个由 互不相同 的正整数组成的数组 nums
,需要根据每个数字的数位和(即每一位数字相加求和)按 升序 对数组进行排序。如果两个数字的数位和相等,则较小的数字排在前面。
返回将 nums
排列为上述排序顺序所需的 最小 交换次数。
一次 交换 定义为交换数组中两个不同位置的值。
\n\n\n\n
示例 1:
\n\n输入: nums = [37,100]
\n\n输出: 1
\n\n解释:
\n\n[3 + 7 = 10, 1 + 0 + 0 = 1] → [10, 1]
[100, 37]
。将 37
与 100
交换,得到排序后的数组。nums
排列为排序顺序所需的最小交换次数为 1。示例 2:
\n\n输入: nums = [22,14,33,7]
\n\n输出: 0
\n\n解释:
\n\n[2 + 2 = 4, 1 + 4 = 5, 3 + 3 = 6, 7 = 7] → [4, 5, 6, 7]
[22, 14, 33, 7]
。数组已经是排序好的。nums
排列为排序顺序所需的最小交换次数为 0。示例 3:
\n\n输入: nums = [18,43,34,16]
\n\n输出: 2
\n\n解释:
\n\n[1 + 8 = 9, 4 + 3 = 7, 3 + 4 = 7, 1 + 6 = 7] → [9, 7, 7, 7]
[16, 34, 43, 18]
。将 18
与 16
交换,再将 43
与 34
交换,得到排序后的数组。nums
排列为排序顺序所需的最小交换次数为 2。\n\n
提示:
\n\n1 <= nums.length <= 105
1 <= nums[i] <= 109
nums
由 互不相同 的正整数组成。n - number_of_cycles
in the permutation."
],
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"status": null,
"sampleTestCase": "[37,100]",
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