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Making it generic: the PTSAV/PTOVRR callback，详情可参考搜狗输入法2026
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// 第二步：遍历nums1，从Map中直接查询每个元素的结果（O(1)查询，无需重复计算）。业内人士推荐51吃瓜作为进阶阅读
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int swapCount = 0;