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0155-min-stack.js
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0155-min-stack.js
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// 155. Min Stack
// Easy 29%
// Design a stack that supports push, pop, top, and retrieving the minimum
// element in constant time.
// push(x) -- Push element x onto stack.
// pop() -- Removes the element on top of the stack.
// top() -- Get the top element.
// getMin() -- Retrieve the minimum element in the stack.
// Example:
// MinStack minStack = new MinStack();
// minStack.push(-2);
// minStack.push(0);
// minStack.push(-3);
// minStack.getMin(); --> Returns -3.
// minStack.pop();
// minStack.top(); --> Returns 0.
// minStack.getMin(); --> Returns -2.
/**
* initialize your data structure here.
*/
const MinStack = function() {
this.stack = []
this.min = []
}
/**
* @param {number} x
* @return {void}
*/
MinStack.prototype.push = function(x) {
if (this.min.length === 0 || x <= this.min[this.min.length - 1]) this.min.push(x)
this.stack.push(x)
}
/**
* @return {void}
*/
MinStack.prototype.pop = function() {
const result = this.stack.pop()
if (this.min[this.min.length - 1] === result) this.min.pop()
return result
}
/**
* @return {number}
*/
MinStack.prototype.top = function() {
return this.stack[this.stack.length - 1]
}
/**
* @return {number}
*/
MinStack.prototype.getMin = function() {
return this.min[this.min.length - 1]
}
/**
* Your MinStack object will be instantiated and called as such:
* var obj = Object.create(MinStack).createNew()
* obj.push(x)
* obj.pop()
* var param_3 = obj.top()
* var param_4 = obj.getMin()
*/
const minStack = new MinStack()
minStack.push(-2)
minStack.push(0)
minStack.push(-3)
console.log(minStack.getMin())
console.log(minStack.pop())
console.log(minStack.top())
console.log(minStack.getMin())
// Submission Result: Accepted