Submission #1072689

#	Time	Username	Problem	Language	Result	Execution time	Memory
1072689		mindiyak	A Difficult(y) Choice (BOI21_books)	C++14	0 / 100	1 ms	1112 KiB

books

#include <bits/stdc++.h>

#include "books.h"
#include <vector>
typedef long long ll;

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.
//

vector<ll> arr(1e5+5,-1);

ll get(int pos){
    if(arr[pos] != -1)return arr[pos];
    arr[pos] = skim(pos);
    return arr[pos];
}

void submit(set<int> a){
    vector<int> b;
    for(int c:a)b.push_back(c);
    answer(b);
}

void solve(int N, int K, long long A, int S) {
    int l = 1,r = N;
    while(l<=r){
        int mid = (l+r)/2;
        if(get(mid) <= A){
            l = mid+1;
        }else{
            r =  mid-1;
        }
    }

    r = l;
    l = K+1;
    set<int> ans;

    ll sm = 0;
    for(int i=1;i<=K;i++){
        sm += get(i);
        ans.insert(i);
    }

    if(sm > 2*A){
        impossible();
        return;
    }

    if(sm <= 2*A && A <= sm){
        submit(ans);
        return;
    }
    while(true){
        if(r < l){
            impossible();
            return;
        }
        while(sm < A){
            if(r < l){
                impossible();
                return;
            }
            ll temp = sm + get(r) - get(*ans.begin());
            if(temp < 2*A){
                sm = temp;
                ans.erase(ans.begin());
                ans.insert(r);
            }
            r--;
        }

        while(sm > 2*A){
            if(r < l){
                impossible();
                return;
            }
            ll temp = sm + get(l) - get(*ans.rbegin());
            if(temp > A){
                sm = temp;
                ans.erase(prev(ans.end()));
                ans.insert(l);
            }
            l++;
        }

        if(sm <= 2*A && A <= sm){
            submit(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