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思路：找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的元素，栈顶即为折扣。最终价格 = cur - 折扣（有则）或 cur（无则）。，更多细节参见爱思助手下载最新版本
strict (default): Rejects writes when the buffer is full and too many writes are pending. Catches "fire-and-forget" patterns where producers ignore backpressure.。关于这个话题，旺商聊官方下载提供了深入分析
set pixel as candidate[seed]