Bloomberg LP Interview Question for Software Engineer Interns


Country: United States
Interview Type: Phone Interview




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class InorderIterator {
    stack = [];
    constructor(root){
        this.moveLeft(root);
    }

    hasNext(){
        return this.stack.length > 0;
    }
    next(){
        if(this.stack.length == 0){
            throw new Error('stack is exhausted');
        }
        const current = this.stack.pop();
        if(current.right !=null){
            this.moveLeft(current.right);
        }
        return current;
    }

    moveLeft(current){
        while(current!=null){
            // push all left subtree into a stack
            this.stack.push(current);
            current = current.left;
        }
    }
}


class PreOrderIterator {
    stack = [];
    constructor(root){
        this.stack.push(root);
    }

    hasNext(){
        return this.stack.length > 0;
    }
    next(){
        const current  = this.stack.pop();
        if(current.right){
            this.stack.push(current.right);
        }
        if(current.left){
            this.stack.push(current.left);
        }
        
        return current;
    }
}

class PostOrderIterator {
    previous = null;
    stack = [];
    constructor(root){
        this.moveLeft(root);

    }
    moveLeft(root){
        while(root!=null){
            this.stack.push(root);
            root = root.left;
        }
    }
    hasNext(){
       return this.stack.length >0;
    }
    next(){
        const current = this.stack[this.stack.length-1];
        if(current.right!= null && this.previous == current.left){
            this.moveLeft(current.right);
        }
        this.previous = this.stack.pop();
        return this.previous;
    }
}

- Binh September 18, 2022 | Flag Reply


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