C - DZY Loves Sequences DZY has a sequence a, consisting of n integers. We'll call a sequence ai, ai + 1, ..., aj (1 ≤ i ≤ j ≤ n) a subsegment of the sequence a. The value (j - i + 1) denotes the length of the subsegment. Your task is to find the lon…

题意:给出一列数,在这个序列里面找到一个连续的严格上升的子串,现在可以任意修改序列里面的一个数,问得到的子串最长是多少 看的题解,自己没有想出来 假设修改的是a[i],那么有三种情况, 1.a[i]>a[i-1],那么求出向左能够延伸的最长的长度 2.a[i]<a[i-1],那么求出向右能够延伸的最长的长度 3.如果修改的这个数刚好夹在两个数的中间,这种情况比上面两种都优, 即为a[i-1]<a[i+1]-1,求出左右能够延伸的最长的长度 然后因为a[i]本身还没有算进去,所以求出最大值…

[链接] 我是链接,点我呀:) [题意] 让你找一段连续的区间 使得这一段区间最多修改一个数字就能变成严格上升的区间. 问你这个区间的最长长度 [题解] dp[0][i]表示以i为结尾的最长严格上升长度 dp[1][i]表示以i作为开头的最长严格上升长度. 然后我们枚举那个改变的位置在什么地方就可以了. 别忘了不改变的那种情况. 可以一起做. [代码] import java.io.*; import java.util.*; public class Main { static InputRe…

447C - DZY Loves Sequences 思路:dp 代码: #include<bits/stdc++.h> using namespace std; #define ll long long const int INF=0x3f3f3f3f; ; int a[N]; int f[N],g[N]; int main() { ios::sync_with_stdio(false); cin.tie(); int n; cin>>n; f[]=; cin>>a[…

题目地址:http://codeforces.com/contest/447/problem/C C. DZY Loves Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY has a sequence a, consisting of n integers. We'll call a sequence…

A. DZY Loves Sequences 题目连接: http://www.codeforces.com/contest/446/problem/A Description DZY has a sequence a, consisting of n integers. We'll call a sequence ai, ai + 1, ..., aj (1 ≤ i ≤ j ≤ n) a subsegment of the sequence a. The value (j - i + 1) d…

题目传送门 /* DP:先用l,r数组记录前缀后缀上升长度,最大值会在三种情况中产生: 1. a[i-1] + 1 < a[i+1],可以改a[i],那么值为l[i-1] + r[i+1] + 1 2. l[i-1] + 1 3. r[i+1] + 1 //修改a[i] */ #include <cstdio> #include <algorithm> #include <cstring> using namespace std; ; const int INF…

C. DZY Loves Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY has a sequence a, consisting of n integers. We'll call a sequence ai, ai + 1, ..., aj (1 ≤ i ≤ j ≤ n) a subsegment…

预处理出每一个数字能够向后延伸多少,然后尝试将两段拼起来. C. DZY Loves Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY has a sequence a, consisting of n integers. We'll call a sequence ai, ai + 1, ..., a…

A. DZY Loves Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY has a sequence a, consisting of n integers. We'll call a sequence ai, ai + 1, ..., aj (1 ≤ i ≤ j ≤ n) a subsegment…