Submission #548075

#	Time	Username	Problem	Language	Result	Execution time	Memory
548075		SamNguyen	Gap (APIO16_gap)	C++14	30 / 100	96 ms	7012 KiB

gap

#include "gap.h"
#include <vector>
#include <iostream>
#include <random>
#include <algorithm>
using namespace std;

const long long INF = 1e18;

mt19937_64 rnd(23478612);

inline long long random(long long MIN, long long MAX) {
	return rnd() % (MAX - MIN + 1) + MIN;
}

long long calc_cost(const vector<long long> &seq) {
	long long res = 0;
	for (int i = 0; i + 1 < (int)seq.size(); i++)
		res = max(res, seq[i + 1] - seq[i]);
	return res;
}

namespace SUB1 {
	long long findGap(int N) {
		vector<long long> seq(N);

		long long L = 0, R = INF;
		for (int i = 0, j = N - 1; i <= j; i++, j--) {
			MinMax(L, R, &seq[i], &seq[j]);
			L = seq[i] + 1, R = seq[j] - 1;
		}

		return calc_cost(seq);
	}
}

namespace SUB2 {
	long long findGap(int N) {
		vector<long long> marks = {0};
		for (int i = 0; i < 2 * N; i++)
			marks.push_back(random(1, INF));
		marks.push_back(INF + 1);
		sort(marks.begin(), marks.end());

		vector<pair<long long, long long>> rep;
		for (int i = 0; i + 1 < (int)marks.size(); i++) {
			long long l, r;
			MinMax(marks[i], marks[i + 1], &l, &r);
			rep.emplace_back(l, r);
		}

		long long ans = 0;
		for (int i = 0; i + 1 < (int)marks.size(); i++) {
			ans = max(ans, rep[i + 1].first - rep[i].second);
		}

		return ans;
	}
}


long long findGap(int T, int N) {
	return (T == 1) ? SUB1::findGap(N) : SUB2::findGap(N);
}

• Subtask 1: 30 / 30
• Subtask 2: 0 / 70