Submission #723328

#	Time	Username	Problem	Language	Result	Execution time	Memory
723328		Marduk	A Difficult(y) Choice (BOI21_books)	C++14	0 / 100	1 ms	208 KiB

books

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

void solve(int N, int K, long long A, int S){
    vector<int> sol;

    int lo = 0, hi = N;
    while(hi-lo>1){
        int mid = (lo+hi)/2;

        if(skim(mid) >= A) hi = mid;
        else lo = mid;
    }

    int x = hi;
    int vx = skim(x);

    long long ans = 0;
    vector<int> f,l;
    f.clear(); l.clear();

    for(int i = 1;i<K;i++){
        long long q = skim(i);
        ans+=q; f.push_back(q);
    }

    if(x < K) impossible();


    if(ans+vx >= A && ans+vx <= 2*A){
        for(int i = 1;i<K;i++) sol.push_back(i);
        sol.push_back(x);
        answer(sol); return;
    }

    if(x <= K) impossible();

    f.push_back(skim(K));
    for(int i = x-K;i<x;i++) l.push_back(skim(i));
    ans+=f[K-1];

    if(ans >= A && ans <= 2*A){
        for(int i = 1;i<=K;i++) sol.push_back(i);
        answer(sol); return;
    }

    for(int i = 0;i<K;i++){
        if(f[i] == l[i]) impossible();
        ans-=f[i]; ans+=l[i];

        if(ans >= A && ans <= 2*A){
            for(int j = 1+i+1;j<=K;j++) sol.push_back(j);
            for(int j = x-1;j>=x-1-i;j--) sol.push_back(j);
            answer(sol); 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