res[i] = stack.length ? stack.at(-1) : -1;
在流量红利尚在的阶段，交易规模的扩张可以掩盖效率与分配问题；但当新增用户放缓、使用频率趋稳，平台增长就不可避免地从规模扩张转向单位变现。这一转变，使抽佣的性质发生了变化。它不再只是对撮合价值的回报，而逐渐承担起补增长的角色。
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Samsung Galaxy S26 vs. S24: After comparing both models, here's my take
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"Trump used this speech the way he uses all of his speeches: as a vehicle to attack anyone who doesn't bend the knee," Meyers concluded, "and since that's the majority of the country, his polling is terrible."
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