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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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Lightning sparked 60% of Canada’s catastrophic 2023 wildfires, which burned tens of millions of acres and forced hundreds of thousands to evacuate. Skyward initially claimed on its website that it could prevent “up to 100% of lightning strikes,” but quietly removed the statement after MIT Technology Review began asking questions.
Фото: Khalil Ashawi / Reuters