package top100liked

import (
	"fmt"
	"testing"
)

// https://leetcode.cn/problems/min-stack/description/?envType=study-plan-v2&envId=top-100-liked

type MinStack struct {
	slice    []int
	minSlice []int // 记录每个层级的最小值
}

func Constructor() MinStack {
	return MinStack{}
}

func (this *MinStack) Push(value int) {
	if len(this.slice) == 0 {
		this.minSlice = append(this.minSlice, value)
	} else {
		this.minSlice = append(this.minSlice, min(this.minSlice[len(this.minSlice)-1], value))
	}
	this.slice = append(this.slice, value)
}

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

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

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

func Test1(t *testing.T) {
	minStack := Constructor()
	minStack.Push(-2)
	minStack.Push(0)
	minStack.Push(-3)
	fmt.Println(minStack.GetMin())
	minStack.Pop()
	fmt.Println(minStack.Top())
	fmt.Println(minStack.GetMin())
}

func Test2(t *testing.T) {
	minStack := Constructor()
	minStack.Push(1)
	minStack.Push(2)
	fmt.Println(minStack.Top())
	fmt.Println(minStack.GetMin())
	minStack.Pop()
	fmt.Println(minStack.GetMin())
	fmt.Println(minStack.Top())
}