Submission #1061136

#	Time	Username	Problem	Language	Result	Execution time	Memory
1061136		Halym2007	Sequence (APIO23_sequence)	C++17	11 / 100	2072 ms	34892 KiB

sequence

#include <bits/stdc++.h>
//#include "sequence.h"
using namespace std;
#define ll long long
#define sz size()
#define ff first
#define ss second
#define pb push_back
#define pii pair <int, int>
const int N = 5e5 + 5;

int a[N], st[N], n;
void gosh (int x) {
	for (int i = x; i <= n; i += i&(-i)) {
		st[i]++;
	}
	
}

int answer (int x) {
	int ret = 0;
//	int kk = 0;
	for (int i = x; i > 0; i -= i&(-i)) {
//		cout << i << " --> " ;
//		kk++;
//		if (kk == 15) {
//			exit(0);
//		} 
		ret += st[i];
	}
	return ret;
}

int cykar (int x, int den) {
//	cout << x << "\n";
	int l = 1, r = n;
	while (l <= r) {
		int md = (l + r) / 2;
//		cout << l << " " << r << "\n";
		int jj = answer(md);
		if (jj < x) {
			l = md + 1;
		}
		else if (x <= jj and answer(md - 1) < x) {
			return md;
		}
		else {
			r = md - 1;
		}
	}
}

int sequence(int N, vector<int> A) {
	n = N;
	for (int i = 0; i < N; ++i) {
		a[i] = A[i];
	}	
	int jogap = 0;
	for (int i = 0; i < n; ++i) {
		multiset <int> s;
		for (int j = i; j < n; ++j) {
			gosh(a[j]);
			s.insert (a[j]);
			pii x;
//			cout << i << " " << j << "\n";
			int san = j - i + 1;
			x.ff = cykar ((san - 1) / 2 + 1, san);		
			x.ss = cykar (san / 2 + 1, san);
//			cout << x.ff << " " << x.ss << "<---";
//			exit(0);
			int ans1 = s.count(x.ff), ans2 = s.count(x.ss);
			
			jogap = max ({ans1, ans2, jogap});
//			if (jogap == 4) {
//				cout << i << " " << j << " " << x.ff << " " << x.ss;
//				exit(0);
//			} 
		}	
		for (int j = 0; j <= n; ++j) {
			st[j] = 0;
		}
	}
	return jogap;
}


//int main() {
//	freopen ("input.txt", "r", stdin);
//  int N;
//  assert(1 == scanf("%d", &N));
//
//  std::vector<int> A(N);
//  for (int i = 0; i < N; ++i) {
//    assert(1 == scanf("%d", &A[i]));
//  }
//
//  int result = sequence(N, A);
//  printf("%d\n", result);
//  return 0;
//}
//

Compilation message (stderr)

sequence.cpp: In function 'int cykar(int, int)':
sequence.cpp:51:1: warning: control reaches end of non-void function [-Wreturn-type]
   51 | }
      | ^

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