设最大的数为$w$,若$n>k+\log w$,那么显然所有$1$都可以保留,否则现在$n\leq k+\log w$. 如果$w\leq 100000$,那么可以DP,设$f[i][j]$表示考虑前$i$个数,保留的数的$or$是$j$时,最多能删除多少个数,时间复杂度$O(nw)$. 如果$w>100000$,那么$k\leq 7$,爆搜即可,时间复杂度$O(C(n,k))$. #include<cstdio> #include<algorithm> using n…

在QT中如果想要自绘标题和边框,一般步骤是: 1) 在创建窗口前设置Qt::FramelessWindowHint标志,设置该标志后会创建一个无标题.无边框的窗口. 2)在客户区域的顶部创建一个自绘标题栏. 3)给窗口绘制一个背景作为边框. 4)如果想要鼠标拖动效果,可以在WM_NCHITTEST消息中返回HTCAPTION,具体方法百度这里不再详述. 但是这样做会导致一个问题: 在win7系统上,将窗口移动到屏幕边缘会自动排列(在屏幕顶部,左边,右边都会自动排列)的功能失效. 如果你的窗口没有…

APPLIES TO: Oracle Database - Enterprise Edition - Version 10.1.0.2 to 11.2.0.3 [Release 10.1 to 11.2]Oracle Database - Enterprise Edition - Version 11.2.0.4 to 11.2.0.4 [Release 11.2]Information in this document applies to any platform.***Checked fo…

前言 我比较喜欢安静,大概和我喜欢研究和琢磨技术原因相关吧,刚好到了元旦节,这几天可以好好学习下EF Core,同时在项目当中用到EF Core,借此机会给予比较深入的理解,这里我们只讲解和EF 6.x中不同,相同的则不再叙述. EntityFramework Core 1.1方法理论详解 当我们利用EF Core查询数据库时如果我们不显式关闭变更追踪的话,此时实体是被追踪的,关于变更追踪我们下节再叙.就像我们之前在EF 6.x中讨论的那样,不建议手动关闭变更追踪,对于有些特殊情况下,关闭变更追…

Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible. Note: The length of num is less than 10002 and will be ≥ k. The given num does not contain any leading zero. Ex…

Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your result is the smallest in lexicographical order among all possible results. Example: Given "bcabc&q…

Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results. Note: The input string may contain letters other than the parentheses ( and ). Examples: "()())()" -> ["()()()",…

Remove all elements from a linked list of integers that have value val. Example Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6 Return: 1 --> 2 --> 3 --> 4 --> 5 Credits:Special thanks to @mithmatt for adding this probl…

Given a sorted linked list, delete all duplicates such that each element appear only once. For example,Given 1->1->2, return 1->2.Given 1->1->2->3->3, return 1->2->3. 移除有序链表中的重复项需要定义个指针指向该链表的第一个元素,然后第一个元素和第二个元素比较,如果重复了,则删掉第二个元素,…

Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. For example,Given 1->2->3->3->4->4->5, return 1->2->5.Given 1->1->1->2->3, return 2->3.…