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Usage: parakeet [options]
，更多细节参见heLLoword翻译官方下载
Think about how you'd search a large room for a lost key. You wouldn't examine every square inch sequentially. You'd split the room into sections (by the couch, near the door, under the table) and rule out entire sections at a glance. "I didn't go near the kitchen, so skip that."
for (int i = start + gap; i < n; i += gap) {