Solution.go

type MinStack struct {
	stk1 []int
	stk2 []int
}

/** initialize your data structure here. */
func Constructor() MinStack {
	return MinStack{[]int{}, []int{math.MaxInt32}}
}

func (this *MinStack) Push(x int) {
	this.stk1 = append(this.stk1, x)
	this.stk2 = append(this.stk2, min(x, this.stk2[len(this.stk2)-1]))
}

func (this *MinStack) Pop() {
	this.stk1 = this.stk1[:len(this.stk1)-1]
	this.stk2 = this.stk2[:len(this.stk2)-1]
}

func (this *MinStack) Top() int {
	return this.stk1[len(this.stk1)-1]
}

func (this *MinStack) GetMin() int {
	return this.stk2[len(this.stk2)-1]
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

/**
 * Your MinStack object will be instantiated and called as such:
 * obj := Constructor();
 * obj.Push(x);
 * obj.Pop();
 * param_3 := obj.Top();
 * param_4 := obj.GetMin();
 */