DataStructure_Algorithm/monotonicStack.js at main · AthulKrishna-736/DataStructure_Algorithm · GitHub

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class MinStack {
    constructor() {
        this.stack = [];
        this.minStack = [];
    }
    push(val) {
        this.stack.push(val);
        if (this.minStack.length === 0 || val <= this.minStack[this.minStack.length - 1]) {
            this.minStack.push(val);
        }
    }
    pop() {
        if (this.stack.length === 0) return null;
        let removed = this.stack.pop();
        if (removed === this.minStack[this.minStack.length - 1]) {
            this.minStack.pop();
        }
        return removed;
    }
    top() {
        return this.stack.length ? this.stack[this.stack.length - 1] : null;
    }
    getMin() {
        return this.minStack.length ? this.minStack[this.minStack.length - 1] : null;
    }
}

class MaxStack {
    constructor() {
        this.stack = [];
        this.maxStack = [];
    }
    push(val) {
        this.stack.push(val);
        if (this.maxStack.length === 0 || val >= this.maxStack[this.maxStack.length - 1]) {
            this.maxStack.push(val);
        }
    }
    pop() {
        if (this.stack.length === 0) return null;
        let removed = this.stack.pop();
        if (removed === this.maxStack[this.maxStack.length - 1]) {
            this.maxStack.pop();
        }
        return removed;
    }
    top() {
        return this.stack.length ? this.stack[this.stack.length - 1] : null;
    }
    getMax() {
        return this.maxStack.length ? this.maxStack[this.maxStack.length - 1] : null;
    }
}

const minStack = new MinStack();
// minStack.push(3);
// minStack.push(5);
// minStack.push(2);
// console.log(minStack.getMin());
// minStack.pop();
// console.log(minStack.getMin());

// const maxStack = new MaxStack();
// maxStack.push(1);
// maxStack.push(4);
// maxStack.push(2);
// console.log(maxStack.getMax());
// maxStack.pop();
// console.log(maxStack.getMax());


class MinStack1 {
    constructor(){
        this.stack = []
        this.minStack = []
    }

    push(val){
        this.stack.push(val)
        if(this.minStack.length == 0 || val <= this.minStack[this.minStack.length - 1]){
            this.minStack.push(val)
        }
    }

    pop(){
        if(this.stack.length == 0) return null
        let removed = this.stack.pop()
        if(removed == this.minStack[this.minStack.length -1]){
            this.minStack.pop()
        }
        return removed
    }

    top(){
        return this.stack.length ? this.stack[this.stack.length - 1] : null
    }

    getMin(){
        return this.minStack.length ? this.minStack[this.minStack.length - 1] : null
    }
}

const minStack1 = new MinStack1()
minStack1.push(10)
// minStack1.push(20)
// minStack1.push(30)
// minStack1.push(40)
// console.log(minStack1.getMin())
// console.log(minStack1.top())
// minStack1.pop()
// console.log(minStack1.getMin())


class MaxStack1 {
    constructor(){
        this.stack = []
        this.maxStack = []
    }

    push(val){
        this.stack.push(val)
        if(this.maxStack.length == 0 || val >= this.maxStack[this.maxStack.length - 1]){
            this.maxStack.push(val)
        }
    }

    pop(){
        if(this.stack.length == 0) return null
        let removed = this.stack.pop()

        if(removed == this.maxStack[this.maxStack.length - 1]){
            this.maxStack.pop()
        }
        return removed
    }

    top(){
        return this.stack.length ? this.stack[this.stack.length - 1] : null
    }

    getMax(){
        return this.maxStack.length ? this.maxStack[this.maxStack.length - 1] : null
    }
}

const maxStack1 = new MaxStack1()
// maxStack1.push(30)
// maxStack1.push(40)
// maxStack1.push(20)
// maxStack1.push(10)
// maxStack1.push(50)
// maxStack1.push(5)
// console.log(maxStack1.top())
// console.log(maxStack1.getMax())
// maxStack1.pop()
// maxStack1.pop()
// console.log(maxStack1.getMax())