Submission #933714

#	Time	Username	Problem	Language	Result	Execution time	Memory
933714		AtabayRajabli	A Difficult(y) Choice (BOI21_books)	C++17	45 / 100	1 ms	648 KiB

books

#include <bits/stdc++.h>
#include "books.h"
 
using namespace std;
 
const int sz = 1e5 + 5;
long long q[sz];
 
long long get(long long x)
{
    if(q[x])return q[x];
    return q[x] = skim(x);
}
 
void solve(int n, int k, long long a, int s)
{
    long long sum = 0; 
    vector<int> v;
    for(int i = 1; i <= k; i++)
    {
        sum += get(i);
        v.push_back(i);
    }
 
    if(sum > 2 * a)impossible();
    if(a <= sum)answer(v);
 
    long long mx = 2 * a - (sum - get(k));
    int l = k + 1, r = n, j = n + 1;
    while(l <= r)
    {
        int m = (l + r) >> 1;
        if(get(m) <= mx)l = m + 1, j = m;
        else r = m - 1;
    }

    if(j == n + 1)impossible();
 
    if(sum - get(k) + get(j) >= a)
    {
        v.pop_back();
        v.push_back(j);
        answer(v);
    }
    
    r = j;
    set<int> cur;
    for(int i = 1; i <= k; i++)cur.insert(i);
    for(int i = 1; r > k; i++)
    {
        sum -= get(i);
        cur.erase(i);
        sum += get(r);
        cur.insert(r);
        r--;
        if(a <= sum && sum <= 2 * a)
        {
            vector<int> ans;
            for(int i : cur)ans.push_back(i);
            answer(ans);
        }
    }

    impossible();
}

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