1200. Minimum Absolute Difference

题目

Given an array of distinct integers arr, find all pairs of elements with the minimum absolute difference of any two elements.

Return a list of pairs in ascending order(with respect to pairs), each pair [a, b] follows

a, b are from arr
a < b
b - a equals to the minimum absolute difference of any two elements in arr

Example 1:

Input: arr = [4,2,1,3]
Output: [[1,2],[2,3],[3,4]]
Explanation: The minimum absolute difference is 1. List all pairs with difference equal to 1 in ascending order.

Example 2:

Input: arr = [1,3,6,10,15]
Output: [[1,3]]

Example 3:

Input: arr = [3,8,-10,23,19,-4,-14,27]
Output: [[-14,-10],[19,23],[23,27]]

Constraints:

2 <= arr.length <= 10^5
-10^6 <= arr[i] <= 10^6

题目大意

给出一个数组，要求找出所有满足条件的数值对 [a,b]：a<b 并且 b-a 的差值是数组中所有两个元素差值的最小值。

解题思路

给出一个数组，要求找出所有满足条件的数值对 [a,b]：a<b 并且 b-a 的差值是数组中所有两个元素差值的最小值。
简单题，按照题意先排序，然后依次求出两个相邻元素的差值，求出最小的差值。最后遍历一遍数组，把所有等于最小差值的数值对都输出。

代码


package leetcode

import (
	"math"
	"sort"
)

func minimumAbsDifference(arr []int) [][]int {
	minDiff, res := math.MaxInt32, [][]int{}
	sort.Ints(arr)
	for i := 1; i < len(arr); i++ {
		if arr[i]-arr[i-1] < minDiff {
			minDiff = arr[i] - arr[i-1]
		}
		if minDiff == 1 {
			break
		}
	}
	for i := 1; i < len(arr); i++ {
		if arr[i]-arr[i-1] == minDiff {
			res = append(res, []int{arr[i-1], arr[i]})
		}
	}
	return res
}