Submission #529623

#	Time	Username	Problem	Language	Result	Execution time	Memory
529623		mjhmjh1104	A Difficult(y) Choice (BOI21_books)	C++17	10 / 100	1 ms	284 KiB

books

#include <map>
#include "books.h"
using namespace std;

map<int, long long> m;
int s;

long long ask(int x) {
    if (s) {
        s--;
        return skim(x);
    } else return (long long)4e18;
}

long long get(int x, int K) {
    long long ret = 0;
    for (int i = 0; i < K; i++) {
        if (m.find(x + i + 1) == m.end()) m[x + i + 1] = ask(x + i + 1);
        ret += m[x + i + 1];
        if (ret > (long long)4e18) ret = (long long)4e18;
    }
    return ret;
}

void solve(int N, int K, long long A, int S) {
    s = S;
    int l = 0, r = N - K;
    while (l < r) {
        int m = (l + r) / 2;
        long long t = get(m, 1);
        if (t < A / K) l = m + 1;
        else r = m;
    }
    for (int e = l; e > l - K && e >= 0; e--) {
        long long t = get(e, K);
        if (t >= A && t <= 2 * A) {
            vector<int> v;
            for (int i = 0; i < K; i++) v.push_back(e + i + 1);
            answer(v);
            return;
        } else if (t < A) break;
    }
    if (l < K - 1 || get(0, K - 1) + get(l, 1) > 2 * A || get(0, K - 1) + get(l, 1) < A) impossible();
    vector<int> v;
    for (int i = 0; i < K - 1; i++) v.push_back(i + 1);
    v.push_back(l + 1);
    answer(v);
}

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