Submission #530337

#	Time	Username	Problem	Language	Result	Execution time	Memory
530337		chaoyue	A Difficult(y) Choice (BOI21_books)	C++17	0 / 100	2 ms	968 KiB

books

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

#define ll long long

void solve(int n, int k, ll A, int S) {
    vector<ll> v(n+1, 0);
    vector<int> ans;
    int l=1, r=n+1, m, pre=0, sum=0;
    for(int i=1; i<k; i++){
    	v[i] = skim(i);
    	pre += v[i];
	}
	//lower bound binary search
	
	while(r-l > 1){
		m = (l+r)/2;
		if(!v[m]) v[m] = skim(m);
		if(v[m] <= A){
			l = m;
		}
		else{
			r = m;
		}
	}
	for(int i=l-1; i>= max(1, l-k+1); i--){
		if(!v[i]) skim(i);
	}
	for(int i=l+1; i<=min(n, l+k-1); i++){
		if(!v[i]) skim(i);
	}
	for(int i=max(0, l-k); i<l; i++){
		sum += v[i];
	}
	for(int i=max(1, l-k+1); i<=min(l, n-k+1); i++){
		sum += v[i+k-1]-v[i-1];
		if(sum >= A && sum < 2*A){
			for(int j=i; j<i+k; j++){
				ans.push_back(j);
			}
			answer(ans);
			return;
		}
	}
	for(int i=max(1, l-k+1); i<=min(n, l+k-1); i++){
		if(v[i] + pre >= A && v[i] + pre < 2*A){
			for(int j=1; j<k; j++){
				ans.push_back(j);
			}
			ans.push_back(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