LeetCode Hot 100里的第121题“买卖股票的最佳时机”，是我每次给人讲算法入门、或者说讲“同一道题如何从暴力到最优”时，一定会拎出来的题。题目短到一眼就能看完，但它同时覆盖了贪心思想、动态规划雏形、状态压缩、边界条件处理这些高频考点，而且真实面试里出现频率极高。不管你是刚 ...
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