23草稿

const result = []
var mergeKLists = function(array) {
    if (array.length === 1) return array; 
    const arrs = []
    const map = new Map()
    for (let i = 0; i < array.length; i += 1) {
        const value = array[i][0]
        if (value || value === 0) {
            arrs.push(value)
            map.set(value, i)   
        } else {
            array.splice(i, 1)
        }
    }
    const min = Math.min(...arrs)
    const index = map.get(min)
    result.push(min)
    if (index && array[index]) array[index].shift()
    if (array.length === 1 && array[0].length === 0) return result
    else if (index && array[index] && array[index].length === 0) array.splice(index, 1)
    return mergeKLists(array)
};