Submission #799610

#	Time	Username	Problem	Language	Result	Execution time	Memory
799610		laurasofia	A Difficult(y) Choice (BOI21_books)	C++14	0 / 100	1 ms	976 KiB

books

#include <bits/stdc++.h>

#include "books.h"

#define vv vector<long long>
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define mkp make_pair
#define INF 1000000003
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

    vector<long long> v(N);
    int y=A/K;
    int l=1;
    int r=N;

    while (l+1<r){
        int m=(l+r)>>1;
        long long k=skim(m);
        if (k>y)r=m;
        else l=m;
    }
    v.resize(K+1);
    long long sum=0;
    FOR(i,0,K){
        if (l+i>N){
            impossible();
            return;
        }
        v[i]=skim(l+i);
        sum+=v[i];
    } 
    vector<int> ans;
    if (sum>=A && sum<=2*A){
       
        FOR(i,0,K)ans.push_back(l+i);
        answer(ans);
        return;
    }
    if (l!=1){
        sum+=skim(l-1);
        sum-=v[K-1];
        l--;
        if (sum>=A && sum<=2*A){
        
        FOR(i,0,K)ans.push_back(l+i);
        answer(ans);
        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