Submission #941847

#	Time	Username	Problem	Language	Result	Execution time	Memory
941847		LCJLY	A Difficult(y) Choice (BOI21_books)	C++14	0 / 100	0 ms	344 KiB

books

#include <bits/stdc++.h>
 
#include "books.h"
 
using namespace std;
 
//code
//skim() impossible() answer({});
#include <bits/stdc++.h>
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;

long long memo[100005];

long long ask(int n){
	if(memo[n]!=-1) return memo[n];
	return memo[n]=skim(n);
}
 
void solve(int n, int k, long long a, int s) {
	long long hold=ask(n);
	vector<int>v;
	if(hold>=a){
		long long counter=0;
		for(int x=1;x<k;x++){
			v.push_back(x);
			counter+=ask(x);
		}
		
		int l=k;
		int r=n;
		int mid;
		while(l<=r){
			mid=(l+r)/2;
			long long take=ask(mid);
			if(take+counter>=a&&take+counter<=2*a){
				v.push_back(mid);
				answer(v);
				return;
			}
			else if(take+counter<a){
				l=mid+1;
			}
			else r=mid-1;
		}
		impossible();
	}
	else{
		long long counter=0;
		vector<pair<long long,long long>>cur;
		for(int x=1;x<=k;x++){
			cur.push_back({ask(x),x});
			counter+=cur.back().first;
		}
		
		int ptr=n;
		//show(counter,counter);
		if((n==k&&counter<a)||counter>2*a){
			impossible();
			return;
		}
		
		while(counter<a&&!cur.empty()){
			counter+=ask(ptr);
			v.push_back(ptr);
			ptr--;
			counter-=cur.back().first;
			cur.pop_back();
		}
		if(counter>=a){
			for(auto it:cur) v.push_back(it.second);
			answer(v);
			return;
		}
		impossible();
	}
}
//code

• 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