이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<iostream>
#include<stdio.h>
#include<math.h>
#include<map>
#include<string>
#include<algorithm>
#include<vector>
#include<string.h>
#include<utility>
#include<set>
#include<cmath>
#include<queue>
#include<deque>
#include<functional>
#include<stack>
#include<limits.h>
#include<iomanip>
#include<unordered_map>
#include<numeric>
#include<tuple>
#include<bitset>
using namespace std;
#define MOD 1000000007
#define int long long
#define ff first
#define ss second
#define endl '\n'
const int mxN=2e5+1;
vector<int> tree(4*mxN);
int cal(int node, int L, int R, int l, int r){
if(L>r||R<l) return 0;
if(L>=l&&R<=r) return tree[node];
return max(cal(node*2,L,(L+R)/2,l,r),cal(node*2+1,(L+R)/2+1,R,l,r));
}
void up(int node, int L, int R, int p, int v){
if(L>p||R<p) return;
if(L==R){
tree[node]=v;
return;
}
up(node*2,L,(L+R)/2,p,v);
up(node*2+1,(L+R)/2+1,R,p,v);
tree[node]=max(tree[node*2],tree[node*2+1]);
}
void solve(){
int n,d; cin>>n>>d;
map<int,int> mp;
vector<int> a(n+1);
for(int i=1; i<=n; i++) cin>>a[i],mp[a[i]];
int k=1;
for(auto& x: mp) x.ss=k++;
for(int i=1; i<=n; i++) a[i]=mp[a[i]];
vector<int> dp(n+2);
for(int i=n; i>=1; i--){
int mx=cal(1,1,n,a[i]+1,n);
up(1,1,n,a[i],mx+1);
dp[i]=max(dp[i+1],mx+1);
}
for(int i=1; i<=n; i++) up(1,1,n,a[i],0);
int ans=0;
for(int i=1; i<=n; i++){
int mx=cal(1,1,n,1,a[i]-1);
up(1,1,n,a[i],mx+1);
ans=max(ans,dp[i+1]+mx+1);
}
cout<<ans;
}
signed main(){
// freopen("248.in", "r", stdin);
// freopen("248.out", "w", stdout);
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t=1;
// cin>>t;
while(t--){
solve();
cout<<endl;
}
return 0;
}
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