Submission #802245

#	Time	Username	Problem	Language	Result	Execution time	Memory
802245		SamAnd	Distributing Candies (IOI21_candies)	C++17	27 / 100	307 ms	30508 KiB

candies

#include "candies.h"
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define m_p make_pair
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()
const int N = 200005;

int n, q, C;

struct ban
{
    int ans, l, r;
    ban(){}
    ban(int ans, int l, int r)
    {
        this->ans = ans;
        this->l = l;
        this->r = r;
    }
};

ban mer(const ban& l, const ban& r)
{
    ban res;
    if (l.ans <= r.l)
        res.ans = r.ans;
    else if (l.ans >= r.r)
        res.ans = r.ans + r.r - r.l;
    else
        res.ans = r.ans + l.ans - r.l;
    res.l = l.l + max(0, r.l - l.ans);
    res.r = l.r - max(0, l.ans + l.r - l.l - r.r);
    if (res.l > res.r)
        res.l = res.r = 0;
    return res;
}

ban t[N * 4];
void bil(int tl, int tr, int pos)
{
    t[pos] = ban(0, 0, C);
    if (tl == tr)
        return;
    int m = (tl + tr) / 2;
    bil(tl, m, pos * 2);
    bil(m + 1, tr, pos * 2 + 1);
}

void ubd(int tl, int tr, int x, int y, int pos)
{
    if (tl == tr)
    {
        y = min(y, C);
        y = max(y, -C);
        if (y == 0)
            t[pos] = ban(0, 0, C);
        else if (y > 0)
            t[pos] = ban(y, 0, C - y);
        else
            t[pos] = ban(0, -y, C);
        return;
    }
    int m = (tl + tr) / 2;
    if (x <= m)
        ubd(tl, m, x, y, pos * 2);
    else
        ubd(m + 1, tr, x, y, pos * 2 + 1);
    t[pos] = mer(t[pos * 2], t[pos * 2 + 1]);
}

vector<int> v[N];

std::vector<int> distribute_candies(std::vector<int> c, std::vector<int> l,
                                    std::vector<int> r, std::vector<int> vv) {

    n = sz(c);
    q = sz(l);

    for (int i = 0; i < q; ++i)
    {
        v[l[i]].push_back((i + 1));
        v[r[i] + 1].push_back(-(i + 1));
    }

    C = c[0];
    bil(0, q - 1, 1);

    vector<int> ans(n);
    for (int i = 0; i < n; ++i)
    {
        for (int j = 0; j < sz(v[i]); ++j)
        {
            if (v[i][j] > 0)
            {
                --v[i][j];
                ubd(0, q - 1, v[i][j], vv[v[i][j]], 1);
            }
            else
            {
                v[i][j] *= -1;
                --v[i][j];
                ubd(0, q - 1, v[i][j], 0, 1);
            }
        }
        ans[i] = t[1].ans;
    }

    return ans;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 8
• Subtask 3: 27 / 27
• Subtask 4: 0 / 29
• Subtask 5: 0 / 33