Submission #767780

#	Time	Username	Problem	Language	Result	Execution time	Memory
767780		raysh07	A Difficult(y) Choice (BOI21_books)	C++17	0 / 100	1 ms	292 KiB

books

#include <bits/stdc++.h>
#include "books.h"

using namespace std;
//
// --- Sample implementation for the task books ---
//
// To compile this program with the sample grader, place:
//     books.h books_sample.cpp sample_grader.cpp
// in a single folder and run:
//     g++ books_sample.cpp sample_grader.cpp
// in this folder.
//

void solve(int n, int k, long long a, int S) {
    // // TODO implement this function
    // if (skim(2) == 42) {
    //     impossible();
    // } else {
    //     answer({1, 3});
    // }
    
    if (skim(1) > 2 * a) impossible();
    int l = 1, r = n;
    while (l != r){
        int mid = (l + r + 1)/2;
        
        if (skim(mid) > 2 * a) r = mid - 1;
        else l = mid;
    }
    
    int x = skim(l);
    assert(x <= 2 * a);
    if (x >= a) answer({l});
    int sum = x;
    int cnt = 1;
    vector <int> ok;
    ok.push_back(l);
    
    for (int i = l - 1; i >= 1; i--){
        cnt++;
        if (cnt > k) break;
        sum += skim(i);
        ok.push_back(i);
        
        if (sum >= a) answer(ok);
    }
    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