Submission #981685

#	Time	Username	Problem	Language	Result	Execution time	Memory
981685		OAleksa	A Difficult(y) Choice (BOI21_books)	C++14	0 / 100	1 ms	696 KiB

books

#include <bits/stdc++.h>

#include "books.h"

using namespace std;
const int N = 1e5 + 69;
long long was[N], sum;
void solve(int n, int k, long long a, int s) {
	int l = 1, r = n, lst = n + 1;
	vector<int> ans;
	while (l <= r) {
		int mid = (l + r) / 2;
		long long b = 0;
		if (was[mid] > 0)
			b = was[mid];
		else
			b = skim(mid);
		was[mid] = b;
		if (b >= a) {
			lst = mid;
			r = mid - 1;
		}
		else
			l = mid + 1;
	}
	if (lst != n + 1) {
		for (int i = 1;i <= k - 1;i++) {
			if (!was[i])
				was[i] = skim(i);
			sum += was[i];
		}
		sum += was[lst];
		if (sum >= a && sum <= 2 * a) {
			for (int i = 1;i <= k - 1;i++)
				ans.push_back(i);
			ans.push_back(lst);
			answer(ans);
		}
	}
	n = lst - 1;
	assert(n >= k);
		for (int i = 1;i <= k;i++) {
		if (!was[i])
			was[i] = skim(i);
		sum += was[i];
	}
	if (sum > 2 * a)
		impossible();
	else if (sum >= a && sum <= 2 * a) {
		for (int i = 1;i <= k;i++)
			ans.push_back(i);
		answer(ans);
	}
	sum = 0;
	for (int i = n, j = 0;j < k;i--,j++) {
		if (!was[i])
			was[i] = skim(i);
		sum += was[i];
	}
	if (sum < a)
		impossible();
	else if (sum >= a && sum <= 2 * a) {
		for (int i = n,j = 0;j < k;i--,j++)
			ans.push_back(i);
		answer(ans);
	}
	assert(was[n] < a && was[n] > 0);
	int ptr = n, d = 0;
	while (d < k) {
		sum -= was[ptr];
		sum += was[n - ptr + 1];
		ptr--;
		d++;
		if (sum >= a && sum <= 2 * a)
			break;
	}
	for (int i = 1;i <= d;i++)
		ans.push_back(i);
	for (int i = n - k + 1;i <= ptr;i++)
		ans.push_back(i);
	assert(sum >= a && sum <= 2 * a);
	answer(ans);
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20