yong-liang-ge-zhan-shi-xian-dui-lie-lcof.ts

export class CQueue {
  stackA: any[]
  stackB: any[]

  constructor () {
    this.stackA = []
    this.stackB = []
  }

  appendTail (value: number): void {
    this.stackA.push(value)
  }

  deleteHead (): number {
    const stackBNum = this.stackB.length

    while (this.stackA.length) {
      this.stackB.push(this.stackA.pop())
    }

    if (stackBNum !== 0) {
      this.stackB.push(...this.stackB.splice(0, stackBNum))
    }

    const tmp = this.stackB.pop()
    return tmp === undefined ? -1 : tmp
  }
}

/**
 * Your CQueue object will be instantiated and called as such:
 * var obj = new CQueue()
 * obj.appendTail(value)
 * var param_2 = obj.deleteHead()
 */