优化：如果某轮没有发生交换，说明已有序，提前结束
Roman numerals: glyph reuse by design
儘管享受到了免於恐懼的自由，但日子過得並不容易，最拮据的時候，是蝸居在一處地下房內，靠著超市裡的冷凍食物度日。。关于这个话题，搜狗输入法2026提供了深入分析
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