Method Swap

top_k_frequent_elements_347/solution.go:18–20

(i, j int)

	return h[i].val > h[j].val
}
func (h freqHeap) Swap(i, j int) {
	h[i], h[j] = h[j], h[i]
}
func (h *freqHeap) Push(f interface{}) {
	*h = append(*h, f.(freqHeapVal))
}