Submission #863665

#	Time	Username	Problem	Language	Result	Execution time	Memory
863665		Ahmed_Solyman	A Difficult(y) Choice (BOI21_books)	C++14	0 / 100	1 ms	600 KiB

books

#include <bits/stdc++.h>
 
#include "books.h"
 
using namespace std;
typedef long long ll;
//
// --- Sample implementation for the task books ---
//
// To compile this program with the sample grader, place:
//     books.h books_sample.cpp sample_grader.cpp
// in a single folder and run:
//     g++ books_sample.cpp sample_grader.cpp
// in this folder.
//
 
void solve(int n, int k, long long a, int s) {
    // TODO implement this function
    ll sum=0;
    vector<int>v;
    for(int i=1;i<k;i++)sum+=skim(i),v.push_back(i);
    vector<int>dp(n,-1);
    int l=k,r=n;
    while(l<=r){
        int mid=l+r>>1;
        ll s=sum;
        if(~dp[mid])sum+=dp[mid];
        else sum+=dp[mid]=skim(mid);
        if(s<a){
            l=mid+1;
        }
        else if(s>a*2){
            r=mid-1;
        }
        else{
            v.push_back(mid);
            answer(v);
        }
    }
    l=1;r=n-k+1;
    while(l<=r){
        int mid=l+r>>1;
        ll S=0;
        vector<int>v;
        for(int i=mid;i<mid+k;i++){
            v.push_back(i);
            if(~dp[i])sum+=dp[i];
            else sum+=dp[i]=skim(i);
        }
        if(S<a){
            l=mid+1;
        }
        else if(S>a*2){
            r=mid-1;
        }
        else{
            answer(v);
        }
    }
    impossible();
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:25:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   25 |         int mid=l+r>>1;
      |                 ~^~
books.cpp:42:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   42 |         int mid=l+r>>1;
      |                 ~^~

• 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