SOURCE

let arr = [123, 12, 32, 14,122,4,6,8,12]

function bubble(arr) {
    for(let i = 0; i < arr.length; i++ ) {
        for(let k = 0; k < arr.length; k++) {
            let temp = 0
            if(arr[k] > arr[k+1]) {
                temp = arr[k]
                arr[k] = arr[k+1]
                arr[k+1] = temp
            }
        }
    }
    return arr
}

function quick(arr) {
    if(arr.length < 2) {
        return arr
    }
    let mid = arr[Math.floor(arr.length / 2)]
    let left = []
    let right = []
    arr.splice(Math.floor(arr.length / 2), 1)
    arr.map(item => {
        if(item < mid) {
            left.push(item)
        } else {
            right.push(item)
        }
    })
    return quick(left).concat(mid,quick(right))
}

function insert(arr) {
    if (!arr || arr.length < 2 ) {
        return arr
    }
    let newArr = [arr[0]]
    for(let i = 0; i < arr.length; i++) {
       if (arr[i] < newArr[0]) {
           newArr.unshift(arr[i])
           continue
       }
       for(let k = newArr.length - 1; k >= 0; k--) {
           if (arr[i] > newArr[k]) {
               newArr.splice(k + 1, 0, arr[i])
               break
           }
       }
    }
    return newArr
}


function long(arr) {
    let repeatIndex = -1
    let max = 0
    for(let i = 0; i < arr.length; i++) {
        for (let k = i - 1; k >= 0; k--){
            if (arr[i] === arr[k]) {
                if (repeatIndex < k) {
                    repeatIndex = k
                }
            }
        }

        if (max < i - repeatIndex) {
            max = i -repeatIndex 
        }
    }
    return max

}

console.log(long(arr))

function mybind(obj = window){
    let _this = this
    return function (...args){
        _this.call(obj,...args)
    }
}