Method swap

common/src/util/min-heap.ts:19–23

(index1: number, index2: number)

  }

  private swap(index1: number, index2: number): void {
    const temp = this.heap[index1]
    this.heap[index1] = this.heap[index2]
    this.heap[index2] = temp
  }

  private siftUp(index: number): void {
    while (index > 0) {