제출 #760112

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
760112		8e7	서열 (APIO23_sequence)	C++17	41 / 100	2086 ms	56284 KiB

sequence

#include "sequence.h"
//Challenge: Accepted
#include <bits/stdc++.h>
using namespace std;
#ifdef zisk
void debug(){cout << endl;}
template<class T, class ... U> void debug(T a, U ...b){cout << a << " ", debug(b...);}
template<class T> void pary(T l, T r) {
	while (l != r) cout << *l << " ", l++;
	cout << endl;
}
#else
#define debug(...) 0
#define pary(...) 0
#endif
#define ll long long
#define maxn 500005
#define ff first
#define ss second
#define pii pair<int, int>
const int inf = 1<<30;
struct segtree{
	int ma[4*maxn], mi[4*maxn], tag[4*maxn];
	int type, N;
	void init(int cur, int l, int r) {
		if (r <= l) return;
		tag[cur] = 0;
		if (r - l == 1) {
			ma[cur] = mi[cur] = type ? N - l : l+1;
			return;
		}
		int m = (l + r) / 2;
		init(cur*2, l, m), init(cur*2+1, m, r);
		ma[cur] = max(ma[cur*2], ma[cur*2+1]);
		mi[cur] = min(mi[cur*2], mi[cur*2+1]);
	}
	void push(int cur, int l, int r) {
		if (!tag[cur]) return;
		ma[cur] += tag[cur];
		mi[cur] += tag[cur];
		if (r - l > 1) {
			tag[cur*2] += tag[cur];
			tag[cur*2+1] += tag[cur];
		}
		tag[cur] = 0;
	}
	void modify(int cur, int l, int r, int ql, int qr, int v) {
		if (r <= l || ql >= r || qr <= l) return;
		push(cur, l, r);
		if (ql <= l && qr >= r) {
			tag[cur] += v;
			return;
		}
		int m = (l + r) / 2;
		modify(cur*2, l, m, ql, qr, v);
		modify(cur*2+1, m, r, ql, qr, v);
		push(cur*2, l, m), push(cur*2+1, m, r);
		ma[cur] = max(ma[cur*2], ma[cur*2+1]);
		mi[cur] = min(mi[cur*2], mi[cur*2+1]);
	}
	pii query(int cur, int l, int r, int ql, int qr) { //(ma, mi)
		if (r <= l || ql >= r || qr <= l) return {-inf, inf};
		push(cur, l, r);
		if (ql <= l && qr >= r) return make_pair(ma[cur], mi[cur]);
		int m = (l + r) / 2;
		pii pl = query(cur*2, l, m, ql, qr), pr = query(cur*2+1, m, r, ql, qr);	
		pl.ff = max(pl.ff, pr.ff);
		pl.ss = min(pl.ss, pr.ss);
		return pl;
	}
	int get(int cur, int l, int r, int x) { 
		if (r <= l) return 0;
		push(cur, l, r);
		if (r - l == 1) return ma[cur];
		int m = (l + r) / 2;
		if (x < m) return get(cur*2, l, m, x);
		else return get(cur*2+1, m, r, x);
	}
} pref, suf;
vector<int> pos[maxn];
int sequence(int N, std::vector<int> A) {
	pref.type = 0, suf.type = 1;
	pref.N = suf.N = N;
	pref.init(1, 0, N), suf.init(1, 0, N);
	for (int i = 0;i < N;i++) {
		pos[A[i]].push_back(i);
	}

	//for (int j = 0;j < N;j++) cout << pref.get(1,0, N, j) << " ";
	//cout << endl;
	
	
	int ans = 1;

	
	for (int i = 1;i <= N;i++) {
		int siz = pos[i].size();
		for (int j = 0;j < siz;j++) {
			pref.modify(1, 0, N, pos[i][j], N, -1);
			suf.modify(1, 0, N, 0, pos[i][j]+1, -1);
		}

		//for (int j = 0;j < N;j++) cout << pref.get(1,0, N, j) << " ";
		//cout << endl;

		for (int j = 0;j < siz;j++) {
			int r = pos[i][j];
			int vj = pref.get(1, 0, N, r);

			auto check = [&] (int ind) {
				int l = pos[i][ind], cnt = j - ind + 1; //[l, r]
				int sum = vj - pref.get(1, 0, N, l), vind = suf.get(1, 0, N, l);
				pii pl = suf.query(1, 0, N, 0, l), pr = pref.query(1, 0, N, r+1, N);
				pii p = {sum + max(0, pl.ff-vind) + max(0, pr.ff-vj), sum + min(0, pl.ss-vind) + min(0, pr.ss-vj)};
				//debug(ind, j, p.ss, p.ff);
				if (max(p.ss, -cnt) <= min(p.ff, cnt)) {
					ans = max(ans, j - ind + 1);
					return true;
				} else {
					return false;
				}
			};
			for (int ind = 0;ind < j;ind++) check(ind);	
		}
		for (int j = 0;j < siz;j++) {
			pref.modify(1, 0, N, pos[i][j], N, -1);
			suf.modify(1, 0, N, 0, pos[i][j]+1, -1);
		}

	}
 	return ans;
}

• Subtask 1: 11 / 11
• Subtask 2: 17 / 17
• Subtask 3: 0 / 7
• Subtask 4: 0 / 12
• Subtask 5: 13 / 13
• Subtask 6: 0 / 22
• Subtask 7: 0 / 18