package main

import (
    "fmt"
    "sort"
)

type byteRange struct {
    start int64
    end   int64
}

type byteRanges []*byteRange

func (brs byteRanges) Continuous(start int64, end int64) bool {
    sort.Slice(brs, func(i, j int) bool {
        return brs[i].start < brs[j].start
    })

    var (
        longestReach int64
        in           bool
    )

    for _, br := range brs {
        if !in {
            // first br satrts laying over the target
            if br.start <= start && br.end >= start {
                longestReach = br.end
                in = true
            }
            continue
        }
        if in && longestReach < br.start-1 {
            break
        }
        longestReach = br.end
    }

    return in && longestReach >= end
}

func main() {
    brs := byteRanges{{5, 9}, {10, 20}}
    fmt.Println(brs.Continuous(0, 2))
}