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export default function numRescueBoats(    people: number[],    limit: number,): number {    let l = 0,        r = people.length - 1;    let ans = 0;    people.sort((a, b) => a - b);    while (l <= r) {        if (l == r) {            ++ans;            break;        } else if (people[l] + people[r] > limit) {            ++ans, r--;        } else ++ans, ++l, --r;    }    return ans;}