Submission #1103937

#TimeUsernameProblemLanguageResultExecution timeMemory
1103937ezzzayGlobal Warming (CEOI18_glo)C++14
25 / 100
2057 ms25752 KiB
#include<bits/stdc++.h> using namespace std; #define int long long #define ff first #define ss second #define pb push_back #define double long double const int N=2e5+5; int a[N]; int dp[N]; int b[N]; int n; int st[4*N]; void update(int node, int L, int R, int idx, int val){ if(L==R){ st[node]=val; return ; } int mid=(L+R)/2; if(L<=idx and idx<=mid){ update(node*2,L,mid,idx,val); } else { update(node*2+1,mid+1,R,idx,val); } st[node]=max(st[node*2],st[node*2+1]); } int find(int node, int L , int R, int l, int r){ if(l>R or L>r)return 0; if(l<=L and R<=r)return st[node]; int mid=(L+R)/2; return max( find(node*2,L,mid,l,r) , find(node*2+1,mid+1,R,l,r)) ; } void sbtsk4(){ map<int,int>mp; for(int i=1;i<=n;i++){ cin>>a[i]; mp[a[i]]; } int ans=0; int idx=1; for(auto it=mp.begin();it!=mp.end();it++){ it->ss = idx++; } for(int i=1;i<=n;i++)a[i]=mp[a[i]]; for(int i=1;i<=n;i++){ dp[i]= find(1,1,n,1,a[i]-1)+1; dp[i]=max(dp[i],1LL); ans=max(dp[i],ans); update(1,1,n,a[i],dp[i]); } cout<<ans; } int fun(int l, int r, int x){ for(int i=0;i<=2000;i++)st[i]=0; for(int i=0;i<=1000;i++){ dp[i]=0; } for(int i=1;i<=n;i++){ if(l<=i and i<=r)b[i]=a[i]-x; else b[i]=a[i]; } map<int,int>mp; for(int i=1;i<=n;i++){ mp[b[i]]; } int ans=0; int idx=1; for(auto it=mp.begin();it!=mp.end();it++){ it->ss = idx++; } for(int i=1;i<=n;i++)b[i]=mp[b[i]]; for(int i=1;i<=n;i++){ dp[i]= find(1,1,n,1,b[i]-1)+1; dp[i]=max(dp[i],1LL); ans=max(dp[i],ans); update(1,1,n,b[i],dp[i]); } return st[1]; } signed main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int x; cin>>n>>x; if(x==0 or x==1e9){ sbtsk4(); return 0; } for(int i=1;i<=n;i++){ cin>>a[i]; } int ans=0; int l=1; for(int r=l+1;r<=n;r++){ ans=max(ans,fun(l,r,x)); ans=max(ans,fun(l,r,-x)); } cout<<ans; }
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