// 原因：先处理右侧元素，把结果存在栈里，供左侧元素直接使用
if (n <= 1) return;
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Then came the bigger leap. In the early 2000s, Gran headed south, determined to prove the model in the far more competitive U.S. market. In 2003, SpeedPro Imaging took root in Texas with three pioneer studios in Austin, San Antonio, and Plano. They were small, lean operations built around large‑format printing and fast turnaround.，这一点在夫子中也有详细论述