function tapeEquilibrium(a: number[]): number {
  let firstPart = 0;
  let secondPart = a.reduce((sum, v) => sum + v, 0);
  let min = Infinity;

  for (let i = 0; i < a.length - 1; i++) {
    firstPart += i;
    secondPart -= i;
    const difference = Math.abs(firstPart - secondPart);
    min = difference < min ? difference : min;
  }

  return min;
}