Submission #1005861

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005861		omsincoconut	Gap (APIO16_gap)	C++17	42.89 / 100	62 ms	14032 KiB

gap

#include <bits/stdc++.h>
#include "gap.h"

using namespace std;
typedef long long ll;

ll findGap1(int N) {
	ll l = 1, r = N;
	ll fl = LLONG_MIN, fr = LLONG_MAX;
	ll arr[N+1];
	while (l <= r) {
		ll *q1 = new ll(0), *q2 = new ll(0);
		MinMax(fl, fr, q1, q2);
		arr[l++] = *q1;
		arr[r--] = *q2;
		fl = *q1+1;
		fr = *q2-1;
	}
	ll ans = 0;
	for (ll i = 1; i < N; i++) ans = max(ans, arr[i+1] - arr[i]);
	return ans;
}

void query(ll s, ll t, ll &q1, ll &q2) {
	ll *qr1 = new ll(0), *qr2 = new ll(0);
	MinMax(s, t, qr1, qr2);
	q1 = *qr1;
	q2 = *qr2;
}

void rec(set<ll> &dt, ll l, ll r) {
	if (l > r) return;

	ll q1, q2;
	query(l, r, q1, q2);
	if (q1 == -1) return;

	dt.insert(q1);
	dt.insert(q2);
	ll mid = (q1+q2)/2;
	rec(dt, q1+1, mid);
	rec(dt, mid+1, q2-1);
}

ll findGap2(int N) {
	set<ll> dt;
	rec(dt, -2e18, 2e18);
	vector<ll> arr;
	for (ll i : dt) arr.push_back(i);
	ll ans = 0;
	for (ll i = 0; i < N-1; i++) ans = max(ans, arr[i+1] - arr[i]);
	return ans;
}

ll findGap(int T, int N) {
	return T == 1 ? findGap1(N) : findGap2(N);
}

• Subtask 1: 30 / 30
• Subtask 2: 12.8863069276 / 70