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export default class CustomStack {    #stack = Array<[number, number]>();    constructor(public capacity: number) {}
    push(x: number): void {        if (this.#stack.length >= this.capacity) {            return;        }        this.#stack.push([x, 0]);    }
    pop(): number {        if (this.#stack.length === 0) return -1;        const last = this.#stack[this.#stack.length - 1];        this.#stack.pop();        if (this.#stack.length) {            this.increment(this.#stack.length, last[1]);        }        return last[0] + last[1];    }
    increment(k: number, val: number): void {        if (this.#stack.length === 0) return;        // console.log(this,k,val)        if (this.#stack.length < k) {            k = this.#stack.length;        }        //   console.log(this,k,val)        this.#stack[k - 1][1] += val;    }}