Submission #839401

#	Time	Username	Problem	Language	Result	Execution time	Memory
839401		abysmal	Abracadabra (CEOI22_abracadabra)	C++14	10 / 100	3035 ms	20740 KiB

Main

#include<iostream>
#include<stdio.h>
#include<stdint.h>
#include<iomanip>
#include<algorithm>
#include<utility>
#include<vector>
#include<stack>
#include<queue>
#include<set>
#include<map>
#include<deque>
#include<math.h>
#include<assert.h>
#include<string.h>
#include<ext/pb_ds/tree_policy.hpp>
#include<ext/pb_ds/assoc_container.hpp>

using namespace std;

const int64_t INF = (int64_t) 1e18 + 100;
const int64_t mINF = (int64_t) 1e9 + 100;
const int64_t MOD = 1e9 + 19972207;
const int64_t MOD2 = 998244353;
const int nbit = 31;
const int ndig = 10;
const int nchar = 26;
const int D = 4;
int dr[D] = {-1, 0, 1, 0};
int dc[D] = {0, 1, 0, -1};
const int Dk = 8;
int drk[Dk] = {2, 2, -2, -2, 1, 1, -1, -1};
int dck[Dk] = {1, -1, 1, -1, 2, -2, 2, -2};

struct Query
{
    int t;
    int k;
    int id;

    Query(int t_, int k_, int id_) : t(t_), k(k_), id(id_) {}

    bool operator < (const Query& o) const
    {
        if(t != o.t) return t < o.t;
        if(k != o.k) return k < o.k;
        return id < o.id;
    }
};

struct Thing
{
    int val;
    int l;
    int r;

    Thing(int val_, int l_, int r_) : val(val_), l(l_), r(r_) {}

    bool operator < (const Thing& o) const
    {
        if(val == o.val)
        {
            if(l == o.l) return r < o.r;
            return l < o.l;
        }
        return val < o.val;
    }
};

struct Solution
{
    int n;
    int q;
    int sum;
    vector<int> a;
    vector<int> nx;
    vector<Query> v;
    vector<Thing> perma;
    Solution() {}

    void solve()
    {
        cin >> n >> q;
        a.resize(n, 0);
        nx.resize(n, n - 1);
        for(int i = 0; i < n; i++)
        {
            cin >> a[i];
        }

        for(int i = 0; i < q; i++)
        {
            int t;
            int k;
            cin >> t >> k;
            t = min(t, n);
            v.push_back(Query(t, k - 1, i));
        }
        sort(v.begin(), v.end());

        sum = n;
        stack<int> s;
        for(int i = 0; i < n; i++)
        {
            while(!s.empty() && a[s.top()] < a[i])
            {
                nx[s.top()] = i - 1;
                s.pop();
            }

            s.push(i);
        }

        int id = 0;
        set<Thing> st;
        while(id < n)
        {
            st.insert(Thing(a[id], id, nx[id]));

            id = nx[id] + 1;
        }

        vector<int> ans(q, -1);
        int x = 0;
        for(int i = 0; i <= n; i++)
        {
//            int tt = 0;
//            for(set<Thing>::iterator it = st.begin(); it != st.end(); it++)
//            {
//                cerr << "tmp = " << tt << "\n";
//                cerr << (*it).val << " " << (*it).l << " " << (*it).r << "\n";
//                tt += ((*it).r - (*it).l + 1);
//            }
//
//            for(int j = perma.size() - 1; j >= 0; j--)
//            {
//                cerr << "tmpp = " << tt << "\n";
//                cerr << perma[j].val << " " << perma[j].l << " " << perma[j].r << "\n";
//                tt += perma[j].r - perma[j].l + 1;
//            }
//            cerr << "\n";
            if(x < q && v[x].t == i)
            {
                int tmp = 0;
                for(set<Thing>::iterator it = st.begin(); it != st.end(); it++)
                {
                    int len = (*it).r - (*it).l + 1;
                    while(x < q && v[x].t == i && tmp + len > v[x].k)
                    {
                        int r = v[x].k - tmp;
                        ans[v[x].id] = a[(*it).l + r];
                        x++;
                    }

                    tmp += len;
                }

                for(int j = perma.size() - 1; j >= 0; j--)
                {
                    int len = perma[j].r - perma[j].l + 1;
                    while(x < q && v[x].t == i && tmp + len > v[x].k)
                    {
                        int r = v[x].k - tmp;
                        ans[v[x].id] = a[perma[j].l + r];
                        x++;
                    }
                    tmp += len;
                }
            }

            Shuffle(st);
        }

        for(int i = 0; i < q; i++)
        {
            cout << ans[i] << "\n";
        }
    }

    void Shuffle(set<Thing>& s)
    {
        if(sum <= n / 2) return;

        int x = 0;
        int tmp = 0;
        int sz = perma.size();
        Thing mid = Thing(-1, -1, -1);
        set<Thing>::iterator id = prev(s.end());
        for(set<Thing>::iterator it = s.begin(); it != s.end(); it++)
        {
            int len = (*it).r - (*it).l + 1;
            if(tmp < n / 2 && tmp + len >= n / 2)
            {
                x = (*it).l + (n / 2 - tmp);
                mid = (*it);
            }

            tmp += len;
        }

        do
        {
            tmp -= ((*id).r - (*id).l + 1);
            if(tmp >= n / 2) perma.push_back((*id));
            id = prev(id);
        } while(id != s.begin() && tmp < n / 2);

        for(int i = sz; i < (int) perma.size(); i++)
        {
            s.erase(perma[i]);
            sum -= (perma[i].r - perma[i].l + 1);
        }

        if(mid.val == -1) return;

        s.erase(mid);
        s.insert(Thing(mid.val, mid.l, x - 1));
        while(x <= mid.r)
        {
            s.insert(Thing(a[x], x, min(nx[x], mid.r)));
            x = nx[x] + 1;
        }
    }

    int modadd(int t1, int t2)
    {
        int res = t1 + t2;
        if(res >= MOD) res -= MOD;
        return res;
    }

    int modsub(int t1, int t2)
    {
        int res = t1 - t2;
        if(res < 0) res += MOD;
        return res;
    }

    int modmul(int t1, int t2)
    {
        int64_t res = 1LL * t1 * t2;
        return res % MOD;
    }

    int Abs(int tmp)
    {
        if(tmp < 0) return -tmp;
        return tmp;
    }

    int MASK(int j)
    {
        return (1 << j);
    }

    bool BIT(int tmp, int j)
    {
        return (tmp & MASK(j));
    }
};

void __setup()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

//    freopen("in.txt", "r", stdin);
//    freopen("out.txt", "w", stdout);
}

int main()
{
    __setup();

    int t = 1;
//    cin >> t;
    for(int i = 1; i <= t; i++)
    {
        Solution().solve();
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25