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class Bitset {    #zeros: Set<number>;    #ones = new Set<number>();    constructor(public size: number) {        this.#zeros = new Set<number>(new Array(size).keys());    }
    fix(idx: number): void {        this.#ones.add(idx);        this.#zeros.delete(idx);    }
    unfix(idx: number): void {        this.#zeros.add(idx);        this.#ones.delete(idx);    }
    flip(): void {        [this.#ones, this.#zeros] = [this.#zeros, this.#ones];    }
    all(): boolean {        return this.#ones.size === this.size;    }
    one(): boolean {        return this.#ones.size > 0;    }
    count(): number {        return this.#ones.size;    }
    toString(): string {        const bits = new Array(this.size)            .fill(0)            .map((_, i) => (this.#ones.has(i) ? "1" : "0"));
        return bits.join("");    }}export default Bitset;