思路：单调递增栈 + k 控制删除次数。高位越小整体越小，遇更小数字时弹出栈顶大数（仅当 k0）；栈空且当前为 0 则跳过（避免前导零）；若遍历完 k 仍0，从末尾再删 k 位。
It's always a fun day for the space nerds when a NASA team has new images to share from the James Webb Space Telescope. Today's pair has brains on the brain, with a look at the fittingly named Exposed Cranium Nebula. More officially, this cloud of space dust and debris is known as Nebula PMR 1. The images shared today may capture a moment in the final stages of a star, as well as giving hints as to how the nebula got its brain-like shape.
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阿宗在同一間工廠工作多年，從未獲得加薪，也不能參加台籍員工能去的員工旅遊與年節尾牙，初來台時，他還曾因工作不熟練被同事警告可能遭遣返。在台灣，若移工表現不佳、不適任工作，雇主可單方面跟移工解約。解約後移工若無法找到新工作，便將被遣返。
But of course, hard coding a size guess is a bit rigid.