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package byteDance;

import java.util.Stack;

/**

* Created by lizeyang on 2020/5/15.

* 最大栈

*/

public class test30 {

static Stack<Integer> stack1 = new Stack<>();

static Stack<Integer> stack2 = new Stack<>();

public static void push(int num) {

if (stack1.isEmpty()) {

stack1.push(num);

stack2.push(num);

} else {

int tmp = stack2.peek();

if (num > tmp) {

stack2.push(num);

} else {

stack2.push(tmp);

}

stack1.push(num);

}

}

public static int pop() {

int res = stack1.pop();

stack2.pop();

return res;

}

public static int getMax() {

int res = 0;

if (!stack2.isEmpty()) {

res = stack2.peek();

}

return res;

}

public static void main(String[] args) {

push(1);

push(2);

System.out.println(getMax());

System.out.println(pop());

}

}