Submission #1205870

#TimeUsernameProblemLanguageResultExecution timeMemory
1205870asli_bgGlobal Warming (CEOI18_glo)C++17
100 / 100
210 ms16544 KiB
#include <bits/stdc++.h> using namespace std; #include <ext/pb_ds/assoc_container.hpp> using namespace __gnu_pbds; #define int long long typedef pair<int,int> pii; typedef vector<int> vi; typedef vector<pii> vii; typedef vector<bool> vb; typedef long long ll; typedef pair<ll,ll> pll; typedef vector<pll> vll; typedef tree<pii,null_type,less<pii>,rb_tree_tag, tree_order_statistics_node_update> oset; #define fi first #define se second #define pb push_back #define pf push_front #define mid (l+r)/2 #define all(x) x.begin(),x.end() #define FOR(i,a) for(int i=0;i<(a);i++) #define FORE(i,a,b) for(int i=(a);i<(b);i++) #define cont(x) for(auto el:x) cout<<el<<' ';cout<<endl; #define contp(x) for(auto el:x) cout<<el.fi<<'-'<<el.se<<' ';cout<<endl; #define sp <<" "<< #define DEBUG(x) cout<<(#x) sp x<<endl #define carp(a,b) (((a%MOD)*(b%MOD))%MOD) #define topla(a,b) (((a%MOD)+(b%MOD))%MOD) const ll INF=1e18; const int MAXN=2e5+5; const int MOD=1e9+7; int tut[MAXN]; signed main(){ ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); int n,x; cin>>n>>x; vi a(n+1); FORE(i,1,n+1) cin>>a[i]; //pref oset pref; FORE(i,1,n+1){ if(pref.empty()){ pref.insert({a[i],i}); tut[i]=1; } else{ auto it=pref.lower_bound({a[i],0}); tut[i]=pref.order_of_key({a[i],0})+1; if(it!=pref.end()){ pref.erase(*it); } pref.insert({a[i],i}); } } int ans=pref.size(); //suf oset suf; int deg=1; for(int i=n;i>0;i--){ if(suf.empty()){ suf.insert({a[i]*-1,i}); deg=1; } else{ a[i]-=x; a[i]*=-1; auto it=suf.lower_bound({a[i],0}); deg=suf.order_of_key({a[i],0})+1; a[i]*=-1; a[i]+=x; a[i]*=-1; it=suf.lower_bound({a[i],0}); if(it!=suf.end()){ suf.erase(*it); } suf.insert({a[i],i}); } ans=max(ans,tut[i]+deg-1); } cout<<ans<<endl; }
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