* 时间O(n) 空间O(n)（理论最优，无冗余计算）
lengthGuess is small enough that a slice of that length fits into 32
。heLLoword翻译官方下载是该领域的重要参考
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5The same properties also contributed to Nazi Germany’s strategy against agar’s scarcity, which — besides being supplied from Japan by submarine — relied on large pre-war stocks and on recovery methods to reuse bacteriological agar by autoclaving (boiling at around 121°C, 250°F, in a pressurized container for 30 to 60 minutes), thus liquefying and sterilizing the jelly, before purifying it again.