模拟三个栈水题,可以练习结构体的使用

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type TripleInOne struct {
    a     []int
    index [3]int
    size  int
}

func Constructor(stackSize int) TripleInOne {
    return TripleInOne {
        make([]int, stackSize * 3 + 10),
        [3]int{0, stackSize, stackSize * 2},
        stackSize,
    }
}

func (this *TripleInOne) Push(stackNum int, value int)  {
    if this.index[stackNum] == (stackNum + 1) * this.size {
        return
    }
    this.a[this.index[stackNum]] = value
    this.index[stackNum] ++
}


func (this *TripleInOne) Pop(stackNum int) int {
    if this.IsEmpty(stackNum) {
        return -1
    }
    ans := this.a[this.index[stackNum] - 1]
    this.index[stackNum] --
    return ans
}


func (this *TripleInOne) Peek(stackNum int) int {
    if this.IsEmpty(stackNum) {
        return -1
    }
    return this.a[this.index[stackNum] - 1]
}


func (this *TripleInOne) IsEmpty(stackNum int) bool {
    //fmt.Println(stackNum)
    if this.index[stackNum] > stackNum * this.size {
        return false
    }
    return true
}


/**
 * Your TripleInOne object will be instantiated and called as such:
 * obj := Constructor(stackSize);
 * obj.Push(stackNum,value);
 * param_2 := obj.Pop(stackNum);
 * param_3 := obj.Peek(stackNum);
 * param_4 := obj.IsEmpty(stackNum);
 */