This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//
//#include <bits/stdc++.h>
//#define pi pair<int,int>
//#define pb push_back
//using namespace std;
//const int inf = 1e5+9;
//int n,sz[inf],ans;
//vector<int> adj[inf];
//set<pi> *lis[inf],*lds[inf];
//
//int querylis(int u,int x){
// if(lis[u]->empty() || lis[u]->begin()->first > x)
// return 1;
// set<pi> ::iterator it = lis[u]->lower_bound(pi(x,0));
// it--;
// return it->second+1;
//}
//
//void insertlis(int u,pi x){
// if(lis[u]->empty())
// return void(lis[u]->insert(x));
// set<pi> ::iterator it;
// if(!lis[u]->empty()){
// it = lis[u]->lower_bound(pi(x.first+1,0));
// if(it != lis[u]->begin() && (--it)->second >= x.second)
// return ;
// }
//
// it = lis[u]->lower_bound(pi(x.first,0));
// if(it != lis[u]->end() && it->first == x.first && it->second <= x.second)
// it = lis[u]->erase(it);
//
// while(it != lis[u]->end() && it->second <= x.second)
// it = lis[u]->erase(it);
// lis[u]->insert(x);
//}
//
//int querylds(int u,int x){
// if(lds[u]->empty() || lds[u]->rbegin()->first < x)
// return 1;
// set<pi> ::iterator it = lds[u]->lower_bound(pi(x,0));
//
// return it->second + 1;
//}
//
//void insertlds(int u,pi x){
// if(lds[u]->empty())
// return void(lds[u]->insert(x));
// set<pi> ::iterator it;
//
// if(!lds[u]->empty()){
// it = lds[u]->lower_bound(pi(x.first,0));
// if(it != lds[u]->end() && it->second >= x.second)
// return ;
// }
//
// it = lds[u]->lower_bound(pi(x.first,0));
// if(it != lds[u]->end() && it->first == x.first && it->second <= x.second)
// it = lds[u]->erase(it);
//
// while(it != lds[u]->begin() && (--it)->second <= x.second)
// it = lds[u]->erase(it);
// lds[u]->insert(x);
//}
//
//void dfs(int u,int p){
// int curans = 0;
// sz[u] = 1;
// int mx = 0,heavy = -1;
// for(auto v:adj[u]){
// if(v == p)
// continue;
// dfs(v,u);
// sz[u] += sz[v];
// if(sz[v] > mx)
// mx = sz[v],heavy = v;
// }
//
// if(heavy == -1)
// lis[u] = new set<pi> (),
// lds[u] = new set<pi> ();
// else
// lis[u] = lis[heavy],
// lds[u] = lds[heavy];
//
// insertlis(u,pi(u,querylis(u,u)));
// insertlds(u,pi(u,querylds(u,u)));
// //light lis with (heavy lds + previous light lds)
// for(auto v:adj[u]){
// if(v == p || v == heavy)continue;
// for(auto o:*lis[v])
// curans = max(curans,o.second + querylds(u,o.first)-1);
// for(auto o:*lds[v])
// insertlds(u,o);
// insertlds(u,pi(u, querylds(v,u) ));
// }
// //light lds with (heavy lis + previous light lis)
// for(auto v:adj[u]){
// if(v == p || v == heavy)
// continue;
// for(auto o:*lds[v])
// curans = max(curans,o.second + querylis(u,o.first)-1);
//
// for(auto o:*lis[v])
// insertlis(u,pi(u,querylis(v,u)));
// insertlis(u,pi(u, querylis(v,u) ));
//
// }
// curans = max(curans,lis[u]->rbegin()->second);
// curans = max(curans,lds[u]->begin()->second);
// ans = max(ans,curans);
//}
//
//void TestCases(){
// scanf("%d",&n);
// ans = 0;
// for(int i=1;i<=n;i++){
// adj[i].clear();
// lis[i] = new set<pi> ();
// lds[i] = new set<pi> ();
//// if(lis[i]!=NULL)
//// delete lis[i];
//// if(lds[i] != NULL)
//// delete lds[i];
// }
// for(int i=1;i<n;++i){
// int a,b;
// scanf("%d%d",&a,&b);
// adj[a].pb(b);
// adj[b].pb(a);
// }
// dfs(1,0);
// printf("%d\n",ans);
//}
//
//int main(){
//
// int t;
// scanf("%d",&t);
// while(t--)
// TestCases();
//}
///*
//1
//3
//1 2
//1 3
//
//*/
#include <bits/stdc++.h>
#define ll long long
#define le node+node
#define ri node+node+1
#define mid (l+r)/2
using namespace std;
const int inf = 4e5+9;
int n,k,a[inf],cnt,id[inf],tree[inf<<2],lis[inf],lds[inf];
map<int,int> mp;
void update(int node,int l,int r,int idx,int val){
if(l == r)
return void(tree[node] = max(tree[node],val));
if(idx <= mid)
update(le,l,mid,idx,val);
else
update(ri,mid+1,r,idx,val);
tree[node] = max(tree[le],tree[ri]);
}
int query(int node,int l,int r,int x,int y){
if(x>y || y<l || x>r || l>r)
return 0;
if(l>=x && r<=y)
return tree[node];
return max(query(le,l,mid,x,y),query(ri,mid+1,r,x,y));
}
int main(){
scanf("%d%d",&n,&k);
for(int i=1;i<=n;i++)
scanf("%d",a+i),mp[a[i]],mp[a[i]-k+1];
for(auto &o:mp)
o.second = ++cnt;
for(int i=1;i<=n;i++){
lis[i] = 1 + query(1,1,cnt,1,mp[a[i]]-1);
update(1,1,cnt,mp[a[i]],lis[i]);
//cout<<lis[i]<<" ";
}
memset(tree,0,sizeof(tree));
for(int i=n;i>=1;i--){
lds[i] = 1 + query(1,1,cnt,mp[a[i]]+1,cnt);
update(1,1,cnt,mp[a[i]],lds[i]);
}
int ans = 0;
memset(tree,0,sizeof(tree));
for(int i=n;i>=1;i--)
ans = max(ans,lis[i] + query(1,1,cnt,mp[a[i]-k+1],mp[a[i]])),update(1,1,n,mp[a[i]],lds[i]);
cout<<ans<<endl;
}
Compilation message (stderr)
glo.cpp: In function 'int main()':
glo.cpp:182:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
182 | scanf("%d%d",&n,&k);
| ~~~~~^~~~~~~~~~~~~~
glo.cpp:184:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
184 | scanf("%d",a+i),mp[a[i]],mp[a[i]-k+1];
| ~~~~~^~~~~~~~~~
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