for (int gap = n / 2; gap 0; gap /= 2) {
The history of most human gestures is never written down, precisely because it is something we learn before literacy or memory and thus something we take entirely for granted.
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“葡萄味蒟蒻果冻”“蒜香辣味波浪薯片”“抹茶巧克力冻干草莓”等与热门实物单品1:1的宠物玩具，在社交媒体上备受好评，这种人宠共情的消费趋势，正在让宠物用品升级为情感共鸣的载体，让爱与陪伴在同款生活仪式感里双向治愈。
odd positions: 9,7,5,3,1 sum to 25;