Submission #943282

#	Time	Username	Problem	Language	Result	Execution time	Memory
943282		siewjh	A Difficult(y) Choice (BOI21_books)	C++17	0 / 100	1 ms	600 KiB

books

#include <bits/stdc++.h>

#include "books.h"

using namespace std;
typedef long long ll;
//
// --- Sample implementation for the task books ---
//
// To compile this program with the sample grader, place:
//     books.h books_sample.cpp sample_grader.cpp
// in a single folder and run:
//     g++ books_sample.cpp sample_grader.cpp
// in this folder.
//

void solve(int N, int K, ll A, int S) {
    int l = 0, r = N, ans = -1;
    while (l <= r){
		if (l == r){
			ans = l;
			break;
		}
		int m = (l + r) >> 1;
		ll res = skim(m);
		if (res * K < A)  l = m + 1;
		else if (res * K > 2 * A) r = m - 1;
		else{
			ans = m;
			break;
		}
	}
	vector<pair<int, ll>> vec;
	vec.push_back({ans, skim(ans)});
	for (int k = 1; k <= 10 && ans - k >= 1; k++) vec.push_back({ans - k, skim(ans - k)});
	for (int k = 1; k <= 10 && ans + k <= N; k++) vec.push_back({ans + k, skim(ans + k)});
	sort(vec.begin(), vec.end());
	int sz = vec.size();
	vector<int> perm;
	for (int i = sz - 1; i >= 0; i--) perm.push_back(i < K);
	do{
		ll ans = 0;
		vector<int> vans;
		for (int i = 0; i < sz; i++)
			if (perm[i]){
				vans.push_back(vec[i].first);
				ans += vec[i].second;
			}
		if (ans >= A && ans <= 2 * A) answer(vans);
	} while (next_permutation(perm.begin(), perm.end()));
	impossible();
}

• 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