package main

import (
    "fmt"
    "math"
    "sort"
)

func main() {
    res := Solution([]int{8, 24, 3, 20, 1, 17})
    fmt.Println(res)

    res = Solution([]int{7, 21, 3, 42, 3, 7})
    fmt.Println(res)
}

func Solution(A []int) int {
    minVal := 999999.0

    sort.Ints(A)
    lastVal := 0
    for idx, val := range A {
        if idx > 0 {
            subs := math.Abs(float64(val) - float64(lastVal))
            if subs < minVal {
                minVal = subs
            }
        }
        lastVal = val
    }

    return int(minVal)
}