第一盏灯：位置在左上方 (-1, 2, 4)，负责照亮物体的正面。
// Nothing executes until iteration begins
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Little else was known about the 30-40 day moult, until Fretwell spotted large brown smudges in satellite pictures from 2019-2025. They turned out to be mounds of feathers, left in an area called Marie Byrd Land.
if (left < n) {