需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
The employment slowdown has raised concern about the health of the economy, but evidence of wider deterioration is elusive.
，这一点在搜狗输入法2026中也有详细论述
Now, he's working on a two-legged version that will require even more responsive legs to keep its balance while lugging Bruton around.
小鹏发 2026 开工信：自动驾驶、机器人与全球化全面加速
Екатерина Щербакова (ночной линейный редактор)