function triangle(a: number[]): number {
  const sorted = [...a].sort((x, y) => x - y);
  const c = sorted.length;
  if (c < 3) {
    return 0;
  }

  for (let i = 0; i < c - 2; i++) {
    if (sorted[i] > 0 && sorted[i] > sorted[i + 2] - sorted[i + 1]) {
      return 1;
    }
  }

  return 0;
}