Submission #969054

#	Time	Username	Problem	Language	Result	Execution time	Memory
969054		CyberCow	A Difficult(y) Choice (BOI21_books)	C++17	20 / 100	136 ms	3608 KiB

books

#include "books.h"
#include <vector>
#include <algorithm>
#include <cmath>
#include <map>
#include <set>

using namespace std;
using ll = long long;
const int N = 100010;
long long v[N];

void solve(int n, int k, long long a, int s) {

    set<pair<long long, int>> se;
    for (int i = 1; i <= n; i++)
    {
        v[i] = skim(i);
        se.insert({ v[i], i });
    }
    int st = 0;
    ll sum = 0;
    for (int i = 1; i <= k; i++)
    {
        sum += v[i];
    }
    for (int i = k; i <= n; i++)
    {
        if (sum >= a && sum <= 2 * a)
        {
            vector<int> ans;
            for (int j = i - k + 1; j <= i; j++)
            {
                ans.push_back(j);
            }
            answer(ans);
            return;
        }
        sum += v[i + 1] - v[i - k + 1];
    }
    sum = 0;
    for (int i = 1; i <= k - 1; i++)
    {
        sum += v[i];
    }
    for (int i = k; i <= n; i++)
    {
        if (sum + v[i] >= a && sum + v[i] <= 2 * a)
        {
            vector<int> ans;
            for (int j = 1; j < k; j++)
            {
                ans.push_back(j);
            }
            ans.push_back(i);
            answer(ans);
            return;
        }
    }
    impossible();
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:21:9: warning: unused variable 'st' [-Wunused-variable]
   21 |     int st = 0;
      |         ^~

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