Submission #748013

#	Time	Username	Problem	Language	Result	Execution time	Memory
748013		vjudge1	A Difficult(y) Choice (BOI21_books)	C++17	100 / 100	1 ms	336 KiB

books

#include <bits/stdc++.h>
#include "books.h"
using namespace std;
long long n,k,a,s;

void solve(int N, int K, long long A, int S) {
    n=N;
    k=K;
    a=A;
    s=S;
    vector<long long>all;
    vector<int>res;
    long long sum=0;
    for(int i=1;i<=k;i++){
        all.push_back(skim(i));
        sum+=all.back();
        res.push_back(i);
    }
    if(sum>2*a){
        impossible();
    }
    if(sum>=a){
        answer(res);
    }
    int low=0,high=n+1,mid;
    while(high-low>1){
        mid=(high+low)>>1;
        if(skim(mid)>=a){
            high=mid;
        }
        else{
            low=mid;
        }
    }
    long long fake=0;
    if(high!=n+1){
        sum-=all.back();
        fake=skim(high);
        sum+=fake;
        if(sum>=a&&sum<=2*a){
            res.pop_back();
            res.push_back(high);
            answer(res);
        }
        sum-=fake;
        sum+=all.back();
    }
    vector<long long>all2,res2;
    long long sum2=0;
    for(int i=max(low-k+1,1ll);i<=low;i++){
        all2.push_back(skim(i));
        res2.push_back(low);
        sum2+=all2.back();
    }
    if(sum2<a){
        impossible();
    }
    while(sum<a)
    {
        sum-=all.back();
        all.pop_back();
        sum+=all2.back();
        all2.pop_back();
        res.pop_back();
    }
    int now=low;
    while((int)res.size()<k){
        res.push_back(low);
        res2.push_back(low);
        low--;
    }
    answer(res);
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:66:9: warning: unused variable 'now' [-Wunused-variable]
   66 |     int now=low;
      |         ^~~

• 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