Submission #549847

#	Time	Username	Problem	Language	Result	Execution time	Memory
549847		Pherokung	A Difficult(y) Choice (BOI21_books)	C++14	0 / 100	1 ms	208 KiB

books

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

void solve(int n, int k, long long a, int s){
	ll be = 1,ed = n;
    vector<int> V;
    while(be <= ed){
        ll mid = (be+ed)/2,val;
		if(skim(mid) > a) ed = mid-1;
		else be = mid+1;
		
		if(ed < k){
			impossible();
			return;
		}
    }
    
    V.push_back(0);
	for(int i=1;i<=k;i++) V.push_back(skim(i));
	for(int i=max((ll)k+1,ed-k+1);i<=ed;i++) V.push_back(skim(i));
   
   	ll qs[25];
	qs[0] = 0;
	for(int i=1;i<V.size();i++) qs[i] = qs[i-1] + V[i];
	
	vector<int> ANS;
	for(int i=0;i<V.size();i++){
		ll val = qs[i] + (qs[V.size()-1] - qs[V.size()-(k-i+1)]);
		if(val >= a && val <= 2*a){
			for(int j=1;j<=i;j++) ANS.push_back(j);
			for(int j=(k-i)-1;j>=0;j--) ANS.push_back(ed-j);
			answer(ANS);
			return;
		}
	}
    
    impossible();
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:10:28: warning: unused variable 'val' [-Wunused-variable]
   10 |         ll mid = (be+ed)/2,val;
      |                            ^~~
books.cpp:26:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |  for(int i=1;i<V.size();i++) qs[i] = qs[i-1] + V[i];
      |              ~^~~~~~~~~
books.cpp:29:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |  for(int i=0;i<V.size();i++){
      |              ~^~~~~~~~~

• 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