Submission #411525

#	Time	Username	Problem	Language	Result	Execution time	Memory
411525		Aldas25	A Difficult(y) Choice (BOI21_books)	C++14	0 / 100	40 ms	308 KiB

books

#include <bits/stdc++.h>

#include "books.h"

using namespace std;

#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define f first
#define s second
#define pb push_back
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef vector<pii> vii;
typedef vector<ll> vl;

const int MAXN = 1e5 + 100;

int n, k, s;
ll a;

unordered_map<int, ll> saved;

ll get (int i) {
    if (saved[i] > 0)return saved[i];
    saved[i] = skim(i);
    return saved[i];
}

ll getS (int i) {
    ll sum = 0;
    FOR(j, i, i+k-1)
        sum += get(j);
    return sum;
}

void ans (int i) {
    vi ret;
    FOR(j, i, i+k-1)
        ret.pb(j);
    answer(ret);
}

void ans2 (int i) {
    vi ret;
    FOR(j, i, i+k-2)
        ret.pb(j);
    ret.pb(i+k);
    answer(ret);
}

set<ll> cont;
map<ll, int> to;

void ansCont () {
    vi ret;
    for (auto p : cont)
        ret.pb(to[p]);
    answer(ret);
}

void solve(int N, int K, long long A, int S) {
    n = N;
    k = K;
    a = A;
    s = S;


    if (s == n) {


        //FOR(i, 1, n) get(i);

        FOR(i, 1, n) FOR(j, i+k-1, n) {
            /// [i;  i + k/2-1] ir [j - k/2+1; j]
            ll s = 0;
            FOR(xx, i, i+k/2-1) s += get(xx);
            FOR(xx, j - (k+1)/2 + 1, j) s += get(xx);
            if (a <= s && s <= 2*a) {
                vi ret;
                FOR(xx, i, i+k/2-1) ret.pb(xx);
                FOR(xx, j - (k+1)/2 + 1, j) ret.pb(xx);
                answer(ret);
                return;
            }
        }

        impossible();
        return;
    }


    int le = 1, ri = n-k+1;
    while (le < ri) {
        int mid = (le+ri+1)/2;
        ll s = getS(mid);
        if (a <= s && s <= 2*a) {
            ans(mid);
            return;
        }

        if (s > 2*a) ri = mid-1;
        else le = mid;
    }

    ll s = getS(le);
    ll altS = 0;
    if (le + k <= n) altS = s - get(le+k-1) + get(le+k);

    if (a <= s && s <= 2*a)
        ans(le);
    else if (a <= altS && altS <= 2*a)
        ans2(le);
    else if (altS > 2*a) {
            /// blogai
        altS += get(le+k-1);
        FOR(j, le, le+k-1) {
            ll curS = altS - get(j);
            if (a <= curS && curS <= 2*a) {
                vi ret;
                FOR(xx, le, le+k-1) {
                    if (xx == j) continue;
                    ret.pb(xx);
                }
                ret.pb(le+k);
                answer(ret);
                return;
            }
        }
    } else
        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