Submission #555800

#	Time	Username	Problem	Language	Result	Execution time	Memory
555800		someone	A Difficult(y) Choice (BOI21_books)	C++14	0 / 100	1 ms	976 KiB

books

#include "books.h"
#include <bits/stdc++.h>
#define ll long long
using namespace std;

const int N = 1e5 + 42, INF = 1e9, MOD = 1e9 + 7;

ll val[N];

ll get(int i) {
    if(val[i] == -1)
        val[i] = skim(i);
    return val[i];
}

int dicho(int deb, int fin, int maxi) {
    if(deb + 1 == fin)
        return deb;
    int med = (deb + fin) >> 1;
    if(get(med) <= maxi)
        return dicho(med, fin, maxi);
    return dicho(deb, med, maxi);
}

void solve(int n, int k, ll a, int s) {
    for(int i = 0; i < N; i++)
        val[i] = -1;
    ll sum = 0;
    for(int i = 1; i <= k; i++)
        sum += get(i);
    if(sum > 2 * a) {
        impossible();
        return;
    }
    if(sum >= a) {
        vector<int> v;
        for(int i = 1; i <= k; i++)
            v.push_back(i);
        answer(v);
        return;
    }
    int id = dicho(k, n+1, 2*a - sum + get(k));
    for(int i = k; i > 0; i--) {
        sum -= get(i);
        sum += get(id + i - k);
        if(a <= sum && sum <= 2 * a) {
            vector<int> v;
            for(int j = 1; j < i; j++)
                v.push_back(j);
            for(int j = id + i - k; j <= id; j++)
                v.push_back(j);
            answer(v);
            return;
        }
    }
    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