* 时间复杂度：O(n)，空间复杂度：O(1)
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8点1氪丨油价或涨超70%；黄金白银出现断崖式下跌；iPhone 17使用一个月后橙色变粉色，苹果官方拒绝保修申请
AI has also appeared on other battlefields. Israel reportedly used AI to identify Hamas targets during the Israel-Hamas war. And autonomous drones are on the front lines in the Russia-Ukraine war, with both Russia and Ukraine employing some variation of autonomous technology.，详情可参考体育直播
the full string aababaabab is a valid match: a·ab·ab·a·ab·ab