496C - Removing Columns 思路:暴力,用vis标记数组实时记录一下之前的行i+1和上一行i否全相等,false表示全相等. 代码: #include<bits/stdc++.h> using namespace std; #define ll long long #define pb push_back #define mem(a,b) memset((a),(b),sizeof(a)) ][]; ]={false}; int main() { ios::sync_wit…

C. Removing Columns time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely r…

题目传送门 /* 题意:删除若干行,使得n行字符串成递增排序 暴力+构造:从前往后枚举列,当之前的顺序已经正确时,之后就不用考虑了,这样删列最小 */ /************************************************ Author :Running_Time Created Time :2015-8-3 10:49:53 File Name :C.cpp *************************************************/ #in…

Removing Columns time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remo…

题目链接: https://codeforces.com/contest/1209/problem/E2 题意: 给出$n$行和$m$列 每次操作循环挪动某列一次 可以执行无数次这样的操作 让每行最大值的累加和最大 数据范围: $1\leq n \leq 12$ $1\leq m \leq 20000$ 分析: 定义$dp[i][j]$,考虑前$i$列,选择状态为$j$的最大值 $ans=dp[m][(1<<n)-1]$ $dp[i][j]$可以由$dp[i-1][k]$转移,$k$是$j$的…

传送门 发现 $n$ 很小,考虑状压 $dp$,但是如果强行枚举列并枚举置换再转移复杂度太高了 考虑推推结论,发现我们只要保留列最大值最大的 $n$ 列即可,证明好像挺显然: 假设我们让列最大值比较小的列贡献给某一行,那么由抽屉原理发现这意味着列最大值排名前 $n$ 的某一列一定没对答案贡献, 此时我们完全可以用那一列的最大值替换原本这一列对答案的贡献,这种情况同样可以推广到列最大值比较小的列贡献给多行的情况 所以证明就完成了 保留完最大的 $n$ 列,然后直接暴力 $dp$,设 $f[i][S…

A. Minimum Difficulty time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mike is trying rock climbing but he is awful at it. There are n holds on the wall, i-th hold is at height ai off the g…

Removing Columns CodeForces - 496C You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely remove one column from the table. The remaining parts are combined forming a new table. For exam…

Table Level Locking The database allows multiple concurrent connections to the same database. To make sure all connections only see consistent data, table level locking is used by default. This mechanism does not allow high concurrency, but is very f…

文章标题 What’s new for Spark SQL in Apache Spark 1.3 作者介绍 Michael Armbrust 文章正文 The Apache Spark 1.3 release represents a major milestone for Spark SQL.  In addition to several major features, we are very excited to announce that the project has officia…