Submission #553111

#	Time	Username	Problem	Language	Result	Execution time	Memory
553111		Vladth11	A Difficult(y) Choice (BOI21_books)	C++14	100 / 100	2 ms	408 KiB

books

#include <bits/stdc++.h>
#include "books.h"
#define debug(x) cerr << #x << " " << x << "\n"
#define debugs(x) cerr << #x << " " << x << " "
 
using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <long double, pii> muchie;
 
const ll NMAX = 1000001;
const ll VMAX = 1001;
const ll INF = (1LL << 60);
const ll MOD = 1000000007;
const ll BLOCK = 447;
const ll base = 31;
const ll nr_of_bits = 21;
 
map <int, ll> mp;
 
ll afla(int i) {
    if(mp.find(i) != mp.end())
        return mp[i];
    return mp[i] = skim(i);
}
 
void solve(int N, int K, long long A, int S) {
    ll sum = 0, i;
    vector <int> first;
    for(int i = 1; i <= K; i++) {
        ll acum = afla(i);
        first.push_back(i);
        sum += acum;
    }
    if(sum > 2 * A) {
        impossible();
        return;
    }
    if(sum >= A && sum <= 2 * A) {
        answer(first);
        return;
    }
    int r = 0, pas = (1 << nr_of_bits);
    while(pas) {
        if(r + pas <= N) {
            ll acum = afla(r + pas);
            if(acum < A) {
                r += pas;
            }
        }
        pas /= 2;
    }
    vector <int> second;
  int ini = r;
  vector <int> trei = first, patru = second;
    if(r < N)
        r++;
    if(r < K){
        impossible();
        return;
    }
    sum = 0;
    for(i = r; i >= r - K + 1; i--) {
        second.push_back(i);
        sum += afla(i);
    }
    if(sum >= A && sum <= 2 * A) {
        answer(second);
        return;
    }
    for(i = r - 1; i >= r - K + 1; i--) {
        sum += afla(first[(r - i) - 1]);
        sum -= afla(second[r - i]);
        swap(second[r - i], first[(r - i) - 1]);
        if(sum >= A && sum <= 2 * A) {
            answer(second);
            return;
        }
    }
  r = ini;
  first = trei;
  second = patru;
  	if(r < K){
        impossible();
        return;
    }
    sum = 0;
    for(i = r; i >= r - K + 1; i--) {
        second.push_back(i);
        sum += afla(i);
    }
    if(sum >= A && sum <= 2 * A) {
        answer(second);
        return;
    }
    for(i = r - 1; i >= r - K + 1; i--) {
        sum += afla(first[(r - i) - 1]);
        sum -= afla(second[r - i]);
        swap(second[r - i], first[(r - i) - 1]);
        if(sum >= A && sum <= 2 * A) {
            answer(second);
            return;
        }
    }
    impossible();
}

• 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