Submission #808859

#	Time	Username	Problem	Language	Result	Execution time	Memory
808859		htphong0909	Holiday (IOI14_holiday)	C++17	100 / 100	1373 ms	5760 KiB

holiday

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include "holiday.h"
#include <bits/stdc++.h>
using namespace std;

void File() 
{

#define file "test"
    freopen(file".in", "r", stdin);
    freopen(file".out", "w", stdout);
}

set<pair<int, int>> chosen;
set<pair<int, int>, greater<>> have;
long long curSum = 0;
int lt = 1;
int rt = 0;
int n, d, start;
int du;
int arr[100001];
long long ans = -1e18;

void trade()
{
    pair<int, int> temp1 = *have.begin();
    pair<int, int> temp2 = *chosen.begin();
    curSum = curSum - temp2.first + temp1.first;
    have.erase(temp1);
    have.insert(temp2);
    chosen.erase(temp2);
    chosen.insert(temp1);
}


void giveToHave()
{
    du++;
    pair <int, int> temp = *chosen.begin();
    have.insert(temp);
    curSum -= temp.first;
    chosen.erase(temp);
}

void giveToChosen()
{
    du--;
    pair <int, int> temp = *have.begin();
    chosen.insert(temp);
    curSum += temp.first;
    have.erase(temp);
}

void Add(int x)
{
    have.insert(make_pair(arr[x], x));
}

/*
void Add(int x)
{
    if (du > 0)
    {
        du--;
        curSum += arr[x];
        chosen.insert(make_pair(arr[x], x));
    }
    else if (arr[x] > chosen.begin()->first)
    {
        curSum -= chosen.begin()->first;
        have.insert(*chosen.begin());
        chosen.erase(chosen.begin());
        chosen.insert(make_pair(arr[x], x));
        curSum += arr[x];
    }
    else have.insert(make_pair(arr[x], x));
}
*/

void Del(int x)
{
    if (chosen.find(make_pair(arr[x], x)) != chosen.end())
    {
        chosen.erase(make_pair(arr[x], x));
        curSum -= arr[x];
        du++;
        if (!have.empty() && du > 0) giveToChosen();
    }
    else have.erase(make_pair(arr[x], x));
}

int calcDis(int l, int r)
{
    if (l > r) return 0;
    if (start <= l) return(l - start + (r - l));
    if (start >= r) return(start - r + (r - l));
    return (min(start - l, r - start) + (r - l));
}

long long cost(int l, int r)
{
    while (lt != l || rt != r)
    {
        while (rt < r)
        {
            du += calcDis(lt, rt) - calcDis(lt, rt + 1);
            rt++;
            Add(rt);
            while (!have.empty() && !chosen.empty() && have.begin()->first > (chosen.begin())->first) trade();
            while (du < 0 && !chosen.empty()) giveToHave();
            while (du > 0 && !have.empty()) giveToChosen();
        }
        while (rt > lt && rt > r)
        {
            du += calcDis(lt, rt) - calcDis(lt, rt - 1);
            Del(rt);
            rt--;
            while (!have.empty() && !chosen.empty() && have.begin()->first > (chosen.begin())->first) trade();
            while (du < 0 && !chosen.empty()) giveToHave();
            while (du > 0 && !have.empty()) giveToChosen();
        }
        while (lt < rt && lt < l)
        {
            du += calcDis(lt, rt) - calcDis(lt + 1, rt);
            Del(lt);
            lt++;
            while (!have.empty() && !chosen.empty() && have.begin()->first > (chosen.begin())->first) trade();
            while (du < 0 && !chosen.empty()) giveToHave();
            while (du > 0 && !have.empty()) giveToChosen();
        }
        while (lt > l)
        {
            du += calcDis(lt, rt) - calcDis(lt - 1, rt);
            lt--;
            Add(lt);
            while (!have.empty() && !chosen.empty() && have.begin()->first > (chosen.begin())->first) trade();
            while (du < 0 && !chosen.empty()) giveToHave();
            while (du > 0 && !have.empty()) giveToChosen();
        }
    }
    return curSum;
}

void divide(int l, int r, int gL, int gR)
{
    if (l > r) return;
    int mid = (l + r) / 2;
    long long bestCost = -1e18;
    int bestPos = gL;
    for (int i = gL; i <= min(mid, gR); i++)
    {
        if (cost(i, mid) > bestCost)
        {
            bestCost = cost(i, mid);
            bestPos = i;
        }
    }
    ans = max(ans, bestCost);
    divide(l, mid - 1, gL, bestPos);
    divide(mid + 1, r, bestPos, gR);
}

long long findMaxAttraction(int _n, int _start, int _d, int *attraction)
{
    n = _n;
    d = _d;
    start = _start + 1;
    for (int i = 1; i <= n; i++) arr[i] = attraction[i - 1];
    du = d;
    divide(1, n, 1, n);
    return ans;
}

/*int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    File();
    cin >> n >> start >> d;
    for (int i = 1; i <= n; i++) cin >> arr[i];
    cout << findMaxAttraction(n, start, d, arr);
    return 0;
}*/

Compilation message (stderr)

holiday.cpp: In function 'void File()':
holiday.cpp:11:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     freopen(file".in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
holiday.cpp:12:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     freopen(file".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 23 / 23
• Subtask 3: 17 / 17
• Subtask 4: 53 / 53