Submission #941830

#	Time	Username	Problem	Language	Result	Execution time	Memory
941830		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({});
void solve(int n, int k, long long a, int s) {
	int hold=skim(n);
	vector<int>v;
	if(hold>=a){
		int counter=0;
		for(int x=1;x<k;x++){
			v.push_back(x);
			counter+=skim(x);
		}
		
		int l=k;
		int r=n;
		int mid;
		while(l<=r){
			mid=(l+r)/2;
			int take=skim(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{
		int counter=0;
		vector<pair<int,int>>cur;
		for(int x=1;x<=k;x++){
			cur.push_back({skim(x),x});
			counter+=cur.back().first;
		}
		
		int ptr=n;
		if(n==k&&counter<a){
			impossible();
			return;
		}
		
		while(counter<a&&!cur.empty()){
			counter+=skim(ptr);
			ptr--;
			counter-=cur.back().first;
			cur.pop_back();
			v.push_back(ptr);
		}
		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