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Kotlin-based LeetCode algorithm problem solutions, regularly updated

There is a newer version: 1.30

package com_github_leetcode

class NestedInteger {
    private var list: MutableList? = null
    private var integer: Int? = null

    constructor() {
        list = ArrayList()
    }

    constructor(list: MutableList?) {
        this.list = list
    }

    constructor(integer: Int?) {
        this.integer = integer
    }

    fun isInteger(): Boolean {
        return integer != null
    }

    fun getInteger(): Int? {
        return integer
    }

    fun getList(): List? {
        return list
    }

    fun add(nestedInteger: NestedInteger) {
        list!!.add(nestedInteger)
    }
}