Submission #1188483

#	Time	Username	Problem	Language	Result	Execution time	Memory
1188483		DanielPr8	A Difficult(y) Choice (BOI21_books)	C++20	60 / 100	1085 ms	1944 KiB

books

#include <bits/stdc++.h>
#include"books.h"
using namespace std;
using ll = __int128_t;
using vll = vector<ll>;
using vvl = vector<vll>;
using pll = pair<ll,ll>;
using vpl = vector<pll>;
using vvp = vector<vpl>;
#define f first
#define s second
#define pb push_back
#define all(v) v.begin(),v.end()


vll passs;
ll k, a;
ll ski(ll a){
    if(passs[a]==-1)return passs[a]=skim(a);
    return passs[a];
}
void sto(){
    while(true){
        cout << "";
    }
}
void answ(vector<int> id){
    if(id.size()!=k)sto();
    ll ans=0;
    for(ll i:id)ans+=ski(i);
    if(ans>a*2)sto();
    if(ans<a)sto();
    answer(id);
}

void solve(int n, int k1, long long a1, int Q) {
    k=k1;a=a1;
    ll s = 1, e = n, m;
    passs = vll(n+1,-1);
    while(s<e){
        m = (s+e+1)/2;
        ll t = ski(m);
        if(t>a)e=m-1;
        else s=m;
    }
    vll v1(k), v2;
    vector<int> id;
    ll v3=-1;
    for(ll i = 0; i < k; ++i){v1[i] = ski(i+1);}
    for(ll i = max<ll>(1, s-k+1); i <= s; ++i){v2.pb(ski(i));id.pb(i);}
    if(s<n)v3=ski(s+1);
    ll p1=0, p2=0;
    for(ll i:v1)p1+=i;
    for(ll i:v2)p2+=i;
    if(p1>2*a)impossible();
    else if(k<=s){
        if(p2>=a){
            for(ll i = 0; i < k; ++i){
                if(p2<=2*a)break;
                id[i]=i+1;
                p2 += v1[i]-v2[i];
            }
            answ(id);
        }
        else if(s<n){
            iota(all(id),1);
            id.back()=s+1;
            if(p1-v1.back()+v3<=a*2)answ(id);
            else impossible();
        }
        else impossible();
    }
    else{
        iota(all(id),1);
        if(p1>=a)answ(id);
        else impossible();
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3: 10 / 10
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 20 / 20
• Subtask 7: 0 / 20