Submission #1005848

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005848		omsincoconut	Gap (APIO16_gap)	C++17	48.69 / 100	38 ms	9040 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;
}

ll findGap2(int N) {
	ll mi, mx;
	query(LLONG_MIN, LLONG_MAX, mi, mx);
	ll ans = (mx-mi+N-1)/N; // by pigeonhole

	ll lst = mi;
	while (lst < mx) {
		ll q1, q2;
		query(lst+1, lst+ans, q1, q2);
		if (q1 == -1) {
			ll cq1, cq2;
			query(lst+1, mx-1, cq1, cq2);
			if (cq1 == -1) {
				ans = mx-lst;
				lst = mx;
			} else {
				ans = cq1-lst;
				lst = cq1;
			}
		} else {
			lst = q2;
		}
	}
	return ans;
}

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

• Subtask 1: 30 / 30
• Subtask 2: 18.6941757093 / 70