// 2. 维护单调递减栈：弹出所有≤当前价格的索引（这些索引对应的价格无法成为后续价格的「上一个更大值」）
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。业内人士推荐体育直播作为进阶阅读
Idempotence: merging a state with itself doesn’t change the state; A ∨ A = A. If Alice merges her own state with itself, the result will be the same state she started with.
GPU: 9-core GPU