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）。
软件内置的 PPT 生成功能，通常经过了模型微调和工程处理，与直接在对话框输入提示词生成有所不同。同时，PPT 质量受提示词影响极大，测试「上限」往往因人而异。。业内人士推荐搜狗输入法下载作为进阶阅读
Some 4,793 people were estimated to be sleeping on the streets on a single night last autumn, according to the latest snapshot figures released by the government on Thursday - a 3% increase from 2024.。夫子对此有专业解读
Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.。同城约会对此有专业解读