제출 #429569

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
429569		Evirir	Financial Report (JOI21_financial)	C++17	0 / 100	178 ms	32796 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

#pragma GCC optimize("Ofast")
#define watch(x) cout<<(#x)<<"="<<(x)<<'\n'
#define mset(d,val) memset(d,val,sizeof(d))
#define setp(x) cout<<fixed<<setprecision(x)
#define forn(i,a,b) for(int i=(a);i<(b);i++)
#define fore(i,a,b) for(int i=(a);i<=(b);i++)
#define pb push_back
#define F first
#define S second
#define pqueue priority_queue
#define fbo find_by_order
#define ook order_of_key
typedef long long ll;
typedef pair<ll,ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef long double ld;
template<typename T>
using pbds = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
void amin(ll &a, ll b){ a=min(a,b); }
void amax(ll &a, ll b){ a=max(a,b); }
void YES(){cout<<"YES\n";} void NO(){cout<<"NO\n";}
void SD(int t=0){ cout<<"PASSED "<<t<<endl; }
const ll INF = ll(1e18);
const int MOD = 998244353;

class PointSegmentTree{
private:
	int size_;
	vector<ll> v;
	void update(int p, ll val, int k, int l, int r)
	{
		if(p < l || r < p) return;
		if(l == r){
			v[k]=val;	//modification
			return;
		}
		int mid = (l+r)>>1;
		update(p, val, k*2, l, mid);
		update(p, val, k*2+1, mid+1, r);
		v[k] = merge(v[k*2], v[k*2+1]);
	}
	ll query(int s, int e, int k, int l, int r)
	{
		if(e < l || r < s) return 0; //dummy value
		if(s <= l && r <= e) return v[k];
		int mid = (l+r)>>1;
		ll lc = query(s, e, k*2, l, mid);
		ll rc = query(s, e, k*2+1, mid+1, r);
		return merge(lc, rc);
	}
	
public:
	PointSegmentTree(): v(vector<ll>()) {}
	PointSegmentTree(int n){
		for(size_=1;size_<n;) size_<<=1;
		v.resize(size_*4);
	}
	//void reset(){}
	inline ll merge(ll x, ll y){
		return max(x,y);
	}
	inline void update(int p, ll val){
		update(p, val, 1, 0, size_-1);
	}
	inline ll query(int l, int r){
		return query(l, r, 1, 0, size_-1);
	}
};

struct DSU {
	struct Node{ int p, sz, l; };
	vector<Node> dsu; int cc;
	Node& operator[](int id){ return dsu[rt(id)]; }
	DSU(int n){ dsu.resize(n);
		forn(i,0,n){ cc=n; dsu[i]={i,1,i}; }
	}
	inline int rt(int u){ return (dsu[u].p==u) ? u : dsu[u].p=rt(dsu[u].p); }
	inline bool sameset(int u, int v){ return rt(u)==rt(v); }
	void merge(int u, int v){
		u = rt(u); v = rt(v);
		if(u == v) return;
		if(dsu[u].sz < dsu[v].sz) swap(u,v);
		dsu[v].p = u;
		dsu[u].sz += dsu[v].sz;
		dsu[u].l = min(dsu[u].l, dsu[v].l);
		cc--;
	}
	inline Node& get(int u){ return dsu[rt(u)]; }
};

const bool DEBUG = 0;
const int MAXN = 300005;

int n,D;
int a[MAXN];
vii eve;
PointSegmentTree st;
DSU dsu(0);
bool vst[MAXN];
vi ban;

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	
	cin>>n>>D;
	forn(i,0,n)
	{
		cin>>a[i];
		eve.pb({a[i],i});
	}
	sort(eve.begin(), eve.end());
	st=PointSegmentTree(n);
	dsu=DSU(n);
	
	for(ii tmp: eve)
	{
		int i=tmp.S;
		
		auto rp=lower_bound(ban.begin(), ban.end(), i);
		int r;
		if(rp==ban.end()) r=n;
		else r=*rp+D;
		st.update(i, 1+st.query(i+1, r-1));
		
		if(i && vst[i-1]) dsu.merge(i,i-1);
		if(i<n-1 && vst[i+1]) dsu.merge(i,i+1);
		if(dsu.get(i).sz>=D) ban.pb(dsu.get(i).l);
		vst[i]=1;
	}
	
	cout<<st.query(0,n-1)+1<<'\n';
	
	return 0;
}

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