so 简单
这已经不是easy了,是easy中的easy
let stack = [];
function push(node)
{
stack.push(node);
}
function pop()
{
return stack.pop();
}
function top()
{
return stack[stack.length-1];
}
function min()
{
let min = Infinity;
stack.forEach(item=>min=Math.min(min,item));
return min;
}
module.exports = {
push : push,
pop : pop,
top : top,
min : min
};