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export default function groupThePeople(groupSizes: number[]): number[][] {    const groups = new Map<number, number[]>();
    for (const [i, size] of groupSizes.entries()) {        const arr = (groups.get(size) ?? []) as number[];
        groups.set(size, arr);
        arr.push(i);    }
    const ans = [] as number[][];
    for (const [size, people] of groups) {        ans.push(            ...Array(Math.floor(people.length / size))                .fill(0)                .map((_, i) => people.slice(i, i + size)),        );    }    return ans;}