Submission #906263

#	Time	Username	Problem	Language	Result	Execution time	Memory
906263		Ahmed57	A Difficult(y) Choice (BOI21_books)	C++17	0 / 100	1 ms	1204 KiB

books

#include "books.h"
#include <bits/stdc++.h>

using namespace std;
void solve(int n,int k,long long a,int s){
    int l = 1 , r = n , ans = n;
    while(l<=r){
        int mid = (l+r)/2;
        if(skim(mid)>a){
            ans = mid;
            r = mid-1;
        }else l = mid+1;
    }
    long long arr[k+1];
    long long las[n+1];
    long long all = 0;
    for(int i= 1;i<=k;i++){
        arr[i] = skim(i);
        if(i<k){
            all+=arr[i];
        }
    }
    for(int i = ans;i>=max(1,ans-k);i--){
        las[i] = skim(i);
    }
    if(all+las[ans]>=a&&all+las[ans]<=2*a&&k-1+(ans>=k)==k){
        vector<int> an;
        for(int i = 1;i<k;i++)an.push_back(i);
        an.push_back(ans);
        answer(an);return ;
    }
    all = 0;
    for(int i = 1;i<=k;i++){
        all+=arr[i];
        long long extra = 0 , cnt = 0;
        for(int j = max(i+1,ans-k);j<min(n+1,max(i+1,ans-k)+(k-i));j++){
            extra+=las[j];
            cnt++;
        }
        if(all+extra>=a&&all+extra<=2*a&&cnt+i==k){
            vector<int> an;
            for(int j = 1;j<=i;j++)an.push_back(j);
            for(int j = max(i+1,ans-k);j<max(i+1,ans-k)+(k-i);j++)an.push_back(j);
            answer(an);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