Boats to Save People

export function numRescueBoats(people: number[], limit: number): number {
  people.sort((a, b) => a - b);
 
  let answer = 0;
  let [left, right] = [0, people.length - 1];
  while (left <= right) {
    if (people[left] + people[right] <= limit) {
      left += 1;
    }
    answer += 1;
    right -= 1;
  }
  return answer;
}