Submission #425770

#	Time	Username	Problem	Language	Result	Execution time	Memory
425770		duality	A Difficult(y) Choice (BOI21_books)	C++14	100 / 100	2 ms	328 KiB

books

#include <bits/stdc++.h>
using namespace std;
#define mp make_pair
#define pb push_back
typedef long long int LLI;
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef vector<pii> vpii;
#include "books.h"

map<int,LLI> M;
LLI query(int i) {
    if (M.count(i)) return M[i];
    else return M[i] = skim(i+1);
}
void solve(int N,int K,long long int A,int S) {
    int i;
    LLI s = 0;
    for (i = 0; i < K; i++) s += query(i);
    if (s > 2*A) impossible();
    else if (s >= A) {
        vi v;
        for (i = 0; i < K; i++) v.pb(i+1);
        answer(v);
    }
    else {
        int l = K-1,r = N-1;
        while (l < r) {
            int m = (l+r+1) / 2;

            if (s-query(K-1)+query(m) <= 2*A) l = m;
            else r = m-1;
        }
        if (s-query(K-1)+query(l) >= A) {
            vi v;
            for (i = 0; i < K-1; i++) v.pb(i+1);
            v.pb(l+1);
            answer(v);
        }
        else {
            s += query(l)-query(K-1);
            for (i = K-2; i >= 0; i--) {
                s += query(l-(K-i)+1)-query(i);
                if (s >= A) break;
            }
            if (i < 0) impossible();
            else {
                int p = i;
                vi v;
                for (i = 0; i < p; i++) v.pb(i+1);
                for (i = l-(K-p)+1; i <= l; i++) v.pb(i+1);
                answer(v);
            }
        }
    }
}

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20