https://www.ciyekua.cn/index.php/2025/03/ zh-CN 花开花败总归尘 Fri, 07 Mar 2025 00:36:00 +0800 Fri, 07 Mar 2025 00:36:00 +0800 https://www.ciyekua.cn/index.php/diary/164.html https://www.ciyekua.cn/index.php/diary/164.html Fri, 07 Mar 2025 00:36:00 +0800 ciye 例题：https://codeforces.com/problemset/problem/279/B 方法一、双指针法 代码实现：https://codeforces.com/problemset/submission/279/309233285 方法二、二分法 代码实现： https://codeforces.com/problemset/submission/279/309240075 注1：可以用`upper_bound()-1`实现不大于`x`的查找 注2：重载`lower_bound()`用的`greater<int>()`仅适用于`从大到小`排序的数组，一定要注意！ ]]> 0 https://www.ciyekua.cn/index.php/diary/164.html#comments https://www.ciyekua.cn/index.php/feed/diary/164.html https://www.ciyekua.cn/index.php/diary/163.html https://www.ciyekua.cn/index.php/diary/163.html Sun, 02 Mar 2025 12:01:00 +0800 ciye 1.bit_width()函数：用于计算二进制有几位 ]]> 0 https://www.ciyekua.cn/index.php/diary/163.html#comments https://www.ciyekua.cn/index.php/feed/diary/163.html https://www.ciyekua.cn/index.php/diary/162.html https://www.ciyekua.cn/index.php/diary/162.html Sun, 02 Mar 2025 11:52:00 +0800 ciye 1. 相关题目：https://ac.nowcoder.com/acm/contest/103610/K 2. 洛谷日报——《浅谈素数筛优化》中提到了一个小技巧，就是有关6的优化：除2、3外的任何质数，除以6的余数一定是1或5~~~ 相关链接：https://www.luogu.com.cn/article/aqmj8yp7 ]]> 0 https://www.ciyekua.cn/index.php/diary/162.html#comments https://www.ciyekua.cn/index.php/feed/diary/162.html