描述：给定字符串 num（非负整数）和整数 k，移除 k 位数字，使剩余数字最小。以字符串形式返回（不含前导零）。
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The UK government is under a legal obligation to reduce carbon emissions to net zero by 2050, after a law change passed in 2019 with cross-party support.
What I’ve learned is that the common mistake is treating isolation as binary. It’s easy to assume that if you use Docker, you are isolated. The reality is that standard Docker gives you namespace isolation, which is just visibility walls on a shared kernel. Whether that is sufficient depends entirely on what you are protecting against.