Submission #469189

#	Time	Username	Problem	Language	Result	Execution time	Memory
469189		Millad	LIS (INOI20_lis)	C++14	20 / 100	4086 ms	117452 KiB

Main

/// In the name of god
#include <bits/stdc++.h>
     
#define F first
#define S second
#define pb push_back
#define debug(x) cerr << #x << " : " << x << '\n'
     
using namespace std;
typedef int ll;
typedef long double ld;
typedef pair<ll, ll> pll;
     
const ll maxn = 1e6 + 5;

ll q, x[maxn], p[maxn], b[maxn], ind[maxn], seg[maxn * 4], dp[maxn], lis;
set <ll> A[maxn], B[maxn];
vector <ll> Qu;
inline ll get_ind(ll id, ll ps = 0, ll v = 1, ll s = 0, ll e = q){
	if(e - s == 1){
		seg[v] = 1;
		return s;
	}
	ll mid = (e + s) >> 1, lc = v << 1, rc = lc | 1, ind;
	if(ps + (mid - s) - seg[lc] < id)ind = get_ind(id, ps + (mid - s) - seg[lc], rc, mid, e);
	else ind = get_ind(id, ps, lc, s, mid);
	seg[v] = seg[lc] + seg[rc];
	return ind;
}
int main(){
	ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
	cin >> q;
	for(ll i = 0; i < q; i ++)cin >> p[i] >> x[i];
	for(ll i = q - 1; i >= 0; i --){
		ind[i] = get_ind(p[i]);
		b[ind[i]] = x[i];
	}
	for(ll i = 0; i < q; i ++){
		ll id = ind[i], d = 1;
		A[x[i]].insert(id);;
		for(ll j = 1; j < x[i]; j ++){
			if(A[j].empty())continue;
			if(*A[j].begin() > id)continue;
			if(*A[j].rbegin() < id){
				d = max(d, dp[*A[j].rbegin()] + 1);
			      	continue;	
			}
			auto pnt = A[j].upper_bound(id);
			pnt --; d = max(d, dp[*pnt] + 1);
		}
		dp[id] = d; B[d].insert(id);
		Qu.pb(id); lis = max(lis, d);
		while(Qu.size()){
			ll id2 = Qu.back(); Qu.pop_back();
			auto pnt = B[dp[id2]].lower_bound(id2);
			vector <ll> vec;
			while(true){
				pnt ++;
				if(pnt == B[dp[id2]].end())break;
				if(b[*pnt] < b[id2])break;
				if(b[*pnt] == b[id2])continue;
				vec.pb(*pnt);
			}
			for(ll j : vec){
				B[dp[j]].erase(j);
				dp[j] ++; lis = max(lis, dp[j]);
				B[dp[j]].insert(j); Qu.pb(j); 
			}
		}
		cout << lis << '\n';
	}
}	

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80