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）。
Москвичей предупредили о резком похолодании09:45
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Our digitised version of the FT newspaper, for easy reading on any device.
If you’re curious about a device’s charging status, an LED power display provides real-time status information. The magnetic cable also ensures you don’t have to deal with annoying tangled cables; just toss it in a bag and rest easy knowing it will be mess-free.
EPA rolls back rules as chemical firms claim provisions in RMP protection system too expensive to implement