Function split

Array/KthLargestElementInAnArray.js:37–43

(arr)

// 归并
function split(arr) {
    let bean = Math.floor((arr.length-1) / 2)
    let left = arr.slice(0, bean)
    let right = arr.slice(bean)

    return [left, right]
}

function merge(arr, arr2) {
    let result = []