function findDuplicates(numbers: number[]): number[] {
  
  if(numbers.length <= 0) return [];

  numbers.sort((a,b) => a-b);
  const arr1 = [...new Set(numbers)];
  const result = [];

  arr1.forEach(x => {

    const hola = numbers.filter(num => num === x);

    if(hola.length > 1){
      result.push(x)
    }

  })


  return result;
}

// No modificar: necesario para evaluar el resultado.
export { findDuplicates };