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输入:num = "1432219", k = 3
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// 步骤2:倒序遍历(从最后一个人往前推,符合"找右侧元素"的直觉)
尽管这是一笔基于长期战略的资源锁定,但对于投资者而言,真金白银的流出与当期报表的承压,终究需要谨慎权衡。
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