function singleNumber(numbers: number[]): number { 
  let array_aux:number[]=[];
for(let i in numbers){
  if(!numbers.includes(numbers[i],Number(i+1))){
    if(!array_aux.includes(numbers[i]))
return numbers[i]
  }
  array_aux.push(numbers[i])

}
  return 0;
}

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