function buildStaircase(n: number): number[][] {
  let count = 0
  const staircase = []

  for(let i = 0; i < n; i++){
    staircase.push(Array.from({ length: i + 1 }, (_) => count += 1))
  }

  return staircase
}

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