{"id":344,"date":"2010-08-13T16:07:00","date_gmt":"2010-08-13T08:07:00","guid":{"rendered":"http:\/\/localhost\/?p=344"},"modified":"2010-08-13T16:07:00","modified_gmt":"2010-08-13T08:07:00","slug":"hnoi2010_chorus_chorus","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/wjmzbmr\/?p=344","title":{"rendered":"[Hnoi2010]chorus \u5408\u5531\u961f"},"content":{"rendered":"\n

[Hnoi2010]chorus \u5408\u5531\u961f<\/p>\n

Time Limit:4000MS  Memory Limit:65536K
Total Submit:97 Accepted:59
Case Time Limit:1000MS<\/p>\n

Description <\/strong><\/p>\n

<\/p>\n

Input <\/strong><\/p>\n

<\/p>\n

Output <\/strong><\/p>\n

<\/p>\n

Sample Input <\/strong><\/p>\n

4
1701 1702 1703 1704<\/p>\n

Sample Output <\/strong><\/p>\n

8<\/p>\n

Hint <\/strong><\/p>\n

<\/p>\n

Source
\u989d\u3002\u3002\u8fd9\u4e2a\u9898\u76ee\u663e\u7136\u53ef\u4ee5\u76f4\u63a5Dp\u3002\u3002\u72b6\u6001\u5c31\u662f\u5f53\u524d\u961f\u5217\uff08\u53ea\u80af\u662f\u4e00\u4e2a\u8fde\u7eed\u5b50\u5e8f\u5217\uff09\u548c\u6700\u540e\u4e00\u4e2a\u662f\u5de6\u8fb9\u8fd8\u662f\u53f3\u8fb9\u3002\u3002
\u7136\u540e\u5c31\u53ef\u4ee5\u65e0\u538b\u529bAC\u4e86\u56e7\u3002\u3002
Code\uff1a
<\/strong><\/p>\n

#include <vector>
#include <algorithm>
#include <utility>
#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <set>
#include <map>
#include <cstring>
#include <time.h>
#define rep(i,n) for(int i=0;i<n;i++)
#define pb push_back
#define Debug(x) cout<<#x<<"="<<x<<endl;
#define For(i,l,r) for(int i=l;i<=r;i++)
#define tr(e,x) for(typeof(x.begin()) e=x.begin();e!=x.end();e++)
#define printTime cout<<"Time:"<<pre-clock()<<endl;pre=clock();
const int inf=~0U>>1,maxn=1000,mod=19650827;
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
int Dp[maxn][maxn][2]={};
int A[maxn],n;
inline void Update(int&x,int c)
{
x+=c;if(x>=mod)x-=mod;
}
int main()
{
\/\/freopen("in","r",stdin);
cin>>n;rep(i,n)scanf("%d",A+i),Dp[i][i][0]=1;
for(int s=1;s<n;s++)
for(int l=0;l+s<=n;l++)
{
int r=s+l;
{
int&ret=Dp[l][r][0];
if(A[l]<A[l+1])Update(ret,Dp[l+1][r][0]);
if(A[l]<A[r])Update(ret,Dp[l+1][r][1]);
}
{
int&ret=Dp[l][r][1];
if(A[r]>A[r-1])Update(ret,Dp[l][r-1][1]);
if(A[r]>A[l])Update(ret,Dp[l][r-1][0]);
}
}
int ans=0;Update(ans,Dp[0][n-1][0]);
Update(ans,Dp[0][n-1][1]);
printf("%dn",ans);
}<\/p>\n","protected":false},"excerpt":{"rendered":"

[Hnoi2010]chorus \u5408\u5531\u961f Time Limit:4000MS  Memory Limit:65536KTotal Submit:97 Accepted:59 Case Time Limit:1000MS Description Input Output Sample Input 41701 1702 1703 1704 Sample Output 8 Hint Source\u989d\u3002\u3002\u8fd9\u4e2a\u9898\u76ee\u663e\u7136\u53ef\u4ee5\u76f4\u63a5Dp\u3002\u3002\u72b6\u6001\u5c31\u662f\u5f53\u524d\u961f\u5217\uff08\u53ea\u80af\u662f\u4e00\u4e2a\u8fde\u7eed\u5b50\u5e8f\u5217\uff09\u548c\u6700\u540e\u4e00\u4e2a\u662f\u5de6\u8fb9\u8fd8\u662f\u53f3\u8fb9\u3002\u3002\u7136\u540e\u5c31\u53ef\u4ee5\u65e0\u538b\u529bAC\u4e86\u56e7\u3002\u3002Code\uff1a #include <vector>#include <algorithm>#include <utility>#include <iostream>#include <cstdio>#include <cmath>#include <cstdlib>#include <set>#include <map>#include <cstring>#include <time.h>#define rep(i,n) for(int i=0;i<n;i++)#define pb push_back#define Debug(x) cout<<#x<<"="<<x<<endl;#define For(i,l,r) for(int i=l;i<=r;i++)#define tr(e,x) for(typeof(x.begin()) e=x.begin();e!=x.end();e++)#define printTime cout<<"Time:"<<pre-clock()<<endl;pre=clock();const int inf=~0U>>1,maxn=1000,mod=19650827;using namespace […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/344"}],"collection":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=344"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=\/wp\/v2\/posts\/344\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=344"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=344"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/wjmzbmr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=344"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}