// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）
Cuba says group shot on US-registered speedboat planned 'armed infiltration'
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Chinese Suppliers Hike Optical Fiber Prices for Russia by 2.5–4x，推荐阅读搜狗输入法2026获取更多信息
This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.