package main

import (
    "fmt"
)

func abs(x int) int {
    if x < 0 {
        return -x
    }
    return x
}

func max(x, y int) int {
    if x > y {
        return x
    }
    return y
}

func distance(x1, y1, x2, y2 int) int {
    return max(abs(x2-x1), abs(y2-y1))
}

func coverPoints(A []int, B []int) int {
    steps := 0
    for i := 1; i < len(A); i++ {
        x1, y1, x2, y2 := A[i-1], B[i-1], A[i], B[i]
        steps += distance(x1, y1, x2, y2)
    }
    return steps
}

func main() {
    fmt.Println(coverPoints([]int{4, 8, -7, -5, -13, 9, -7, 8},
        []int{4, -15, -10, -3, -13, 12, 8, -8}))
}