巧用二分的一些题目 | gjxhlan's blog



巧用二分的一些题目 | gjxhlan's blog

有些时候，某些题目从不同的角度思考都可以得到正确的结果，但是其时间和空间复杂度却大不一样。

例如一道题可以通过递推去正向求解，但是时间复杂度可能会较高；如果这道题的某些值在一个特定的范围之内，而且我们又可以给出一个采纳或放弃这个解的线性时间的判别条件的话，不妨换个思路直接对解的值采用二分查找的策略，从而可以快速排除一些不需要枚举的状态。


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