int n1 = mid - left; // 左子数组长度
In 1992, in a small shop in British Columbia, a sign maker named Blair Gran stared at a wall full of half-finished jobs and felt something click. Sign-making was treated like a commodity — orders in, banners out — but as thousands of signs came through his shop, he couldn’t help but notice the difference between the good ones and the bad ones. He could see that every sign that left his shop was either helping a business get noticed, or letting it disappear in plain sight.
，这一点在同城约会中也有详细论述
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100+ design types (social media posts, presentations, letters, and more)，这一点在搜狗输入法2026中也有详细论述
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