oj.uz

Submission #1117301

# Submission time Handle Problem Language Result Execution time Memory
1117301 2024-11-23T09:33:27 Z 0x34c Abracadabra (CEOI22_abracadabra) C++17
100 / 100
 498 ms 78656 KB 
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define endl '\n'
#define int ll

using namespace std;

struct block
{
    int head, l, r;

    bool operator<(const block &y) const
    {
        return head < y.head;
    }
};

struct qry
{
    int t, i, idx;
};

struct segtree
{
private:
    vector<int> tree;
    int n;

    void update(int idx, int val, int v, int tl, int tr)
    {
        if (tl == tr)
            tree[v] = val;
        else
        {
            int m = (tl + tr) / 2;
            if (idx <= m)
                update(idx, val, 2 * v, tl, m);
            else
                update(idx, val, 2 * v + 1, m + 1, tr);
            tree[v] = tree[2 * v] + tree[2 * v + 1];
        }
    }

    pii query(int idx, int v, int tl, int tr)
    {
        if (tl == tr)
            return {tl, idx};
        else
        {
            int m = (tl + tr) / 2;
            if (tree[2 * v] > idx)
                return query(idx, 2 * v, tl, m);
            else
                return query(idx - tree[2 * v], 2 * v + 1, m + 1, tr);
        }
    }

public:
    segtree(int _n)
    {
        n = _n;
        tree.resize(4 * n, 0);
    }

    void update(int idx, int val)
    {
        return update(idx, val, 1, 0, n - 1);
    }

    pii query(int idx)
    {
        return query(idx, 1, 0, n - 1);
    }
};

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int N, Q;
    cin >> N >> Q;

    vector<int> arr(N);
    vector<int> nxt(N, -1), res(Q, 0);
    for (int i = 0; i < N; i++)
        cin >> arr[i];

    vector<qry> queries(Q);
    for (int i = 0; i < Q; i++)
    {
        cin >> queries[i].t >> queries[i].i;
        queries[i].i--;
        queries[i].t = min(queries[i].t, N);
        queries[i].idx = i;
    }

    sort(queries.begin(), queries.end(), [](qry &a, qry &b)
         { return a.t < b.t; });

    int q_idx = 0;
    while (q_idx < Q && queries[q_idx].t == 0)
    {
        res[queries[q_idx].idx] = arr[queries[q_idx].i];
        q_idx++;
    }

    stack<int> stk;
    for (int i = N - 1; i >= 0; i--)
    {
        while (!stk.empty() && arr[stk.top()] < arr[i])
            stk.pop();

        nxt[i] = stk.empty() ? N : stk.top();
        stk.push(i);
    }

    segtree tree(N + 1);
    vector<block> block_props(N + 1);
    set<block> blocks;
    int block_cnt = 0;
    for (int i = 0; i < N; i++)
    {
        block_props[arr[i]] = {arr[i], i, nxt[i] - 1};
        blocks.insert({arr[i], i, nxt[i] - 1});
        tree.update(arr[i], nxt[i] - i);
        block_cnt++;
        i = nxt[i] - 1;
    }

    vector<block> fixed_blocks;
    int idx = N - 1;
    int t = 0;
    while (idx != N / 2 - 1)
    {
        block b = *blocks.rbegin();
        blocks.erase(b);

        int sz = b.r - b.l + 1;
        idx -= sz;
        if (idx + 1 >= N / 2)
        {
            fixed_blocks.push_back(b);
            continue;
        }

        // we want to make the block smaller
        int k = N / 2 - 1 - idx - 1;
        blocks.insert({b.head, b.l, b.l + k});
        block_props[b.head] = {b.head, b.l, b.l + k};
        tree.update(b.head, k + 1);
        idx += k + 1;

        for (int i = b.l + k + 1; i <= b.r; i = nxt[i])
        {
            int j = nxt[i];
            blocks.insert({arr[i], i, min(j - 1, b.r)});
            block_props[arr[i]] = {arr[i], i, min(j - 1, b.r)};
            tree.update(arr[i], min(j - 1, b.r) - i + 1);
            idx += min(j - 1, b.r) - i + 1;
        }
        t++;

        while (q_idx < Q && queries[q_idx].t == t)
        {
            int fidx = queries[q_idx].i;
            pii fres = tree.query(fidx);
            res[queries[q_idx].idx] = arr[block_props[fres.first].l + fres.second];
            q_idx++;
        }
    }

    while (q_idx < Q)
    {
        int fidx = queries[q_idx].i;
        pii fres = tree.query(fidx);
        res[queries[q_idx].idx] = arr[block_props[fres.first].l + fres.second];
        q_idx++;
    }

    // while (!blocks.empty())
    // {
    //     fixed_blocks.push_back(*blocks.rbegin());
    //     blocks.erase(*blocks.rbegin());
    // }

    // reverse(fixed_blocks.begin(), fixed_blocks.end());

    for (int q : res)
        cout << q << endl;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 238 ms 43336 KB Output is correct
2 Correct 244 ms 43080 KB Output is correct
3 Correct 224 ms 41544 KB Output is correct
4 Correct 184 ms 40172 KB Output is correct
5 Correct 215 ms 42568 KB Output is correct
6 Correct 201 ms 40376 KB Output is correct
7 Correct 221 ms 42824 KB Output is correct
8 Correct 222 ms 40688 KB Output is correct
9 Correct 201 ms 40264 KB Output is correct
10 Correct 206 ms 40892 KB Output is correct
11 Correct 209 ms 40776 KB Output is correct
12 Correct 200 ms 39524 KB Output is correct
13 Correct 201 ms 40776 KB Output is correct
14 Correct 210 ms 41808 KB Output is correct
15 Correct 218 ms 41884 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 159 ms 40264 KB Output is correct
18 Correct 228 ms 40008 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 344 ms 75196 KB Output is correct
2 Correct 342 ms 78656 KB Output is correct
3 Correct 333 ms 63276 KB Output is correct
4 Correct 238 ms 57616 KB Output is correct
5 Correct 248 ms 58952 KB Output is correct
6 Correct 236 ms 56648 KB Output is correct
7 Correct 260 ms 66888 KB Output is correct
8 Correct 249 ms 65096 KB Output is correct
9 Correct 258 ms 57928 KB Output is correct
10 Correct 250 ms 62028 KB Output is correct
11 Correct 187 ms 53464 KB Output is correct
12 Correct 204 ms 53104 KB Output is correct
13 Correct 268 ms 61256 KB Output is correct
14 Correct 212 ms 54552 KB Output is correct
15 Correct 234 ms 63304 KB Output is correct
16 Correct 31 ms 15688 KB Output is correct
17 Correct 249 ms 75136 KB Output is correct
18 Correct 234 ms 50636 KB Output is correct
19 Correct 58 ms 24648 KB Output is correct
20 Correct 74 ms 25672 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 17088 KB Output is correct
2 Correct 83 ms 18308 KB Output is correct
3 Correct 99 ms 17340 KB Output is correct
4 Correct 43 ms 13128 KB Output is correct
5 Correct 70 ms 15612 KB Output is correct
6 Correct 44 ms 13128 KB Output is correct
7 Correct 56 ms 14776 KB Output is correct
8 Correct 54 ms 13752 KB Output is correct
9 Correct 59 ms 14664 KB Output is correct
10 Correct 37 ms 12360 KB Output is correct
11 Correct 41 ms 12616 KB Output is correct
12 Correct 35 ms 12104 KB Output is correct
13 Correct 39 ms 12616 KB Output is correct
14 Correct 39 ms 12616 KB Output is correct
15 Correct 35 ms 12368 KB Output is correct
16 Correct 12 ms 8016 KB Output is correct
17 Correct 61 ms 19076 KB Output is correct
18 Correct 37 ms 12040 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 504 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 238 ms 43336 KB Output is correct
2 Correct 244 ms 43080 KB Output is correct
3 Correct 224 ms 41544 KB Output is correct
4 Correct 184 ms 40172 KB Output is correct
5 Correct 215 ms 42568 KB Output is correct
6 Correct 201 ms 40376 KB Output is correct
7 Correct 221 ms 42824 KB Output is correct
8 Correct 222 ms 40688 KB Output is correct
9 Correct 201 ms 40264 KB Output is correct
10 Correct 206 ms 40892 KB Output is correct
11 Correct 209 ms 40776 KB Output is correct
12 Correct 200 ms 39524 KB Output is correct
13 Correct 201 ms 40776 KB Output is correct
14 Correct 210 ms 41808 KB Output is correct
15 Correct 218 ms 41884 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 159 ms 40264 KB Output is correct
18 Correct 228 ms 40008 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 344 ms 75196 KB Output is correct
22 Correct 342 ms 78656 KB Output is correct
23 Correct 333 ms 63276 KB Output is correct
24 Correct 238 ms 57616 KB Output is correct
25 Correct 248 ms 58952 KB Output is correct
26 Correct 236 ms 56648 KB Output is correct
27 Correct 260 ms 66888 KB Output is correct
28 Correct 249 ms 65096 KB Output is correct
29 Correct 258 ms 57928 KB Output is correct
30 Correct 250 ms 62028 KB Output is correct
31 Correct 187 ms 53464 KB Output is correct
32 Correct 204 ms 53104 KB Output is correct
33 Correct 268 ms 61256 KB Output is correct
34 Correct 212 ms 54552 KB Output is correct
35 Correct 234 ms 63304 KB Output is correct
36 Correct 31 ms 15688 KB Output is correct
37 Correct 249 ms 75136 KB Output is correct
38 Correct 234 ms 50636 KB Output is correct
39 Correct 58 ms 24648 KB Output is correct
40 Correct 74 ms 25672 KB Output is correct
41 Correct 84 ms 17088 KB Output is correct
42 Correct 83 ms 18308 KB Output is correct
43 Correct 99 ms 17340 KB Output is correct
44 Correct 43 ms 13128 KB Output is correct
45 Correct 70 ms 15612 KB Output is correct
46 Correct 44 ms 13128 KB Output is correct
47 Correct 56 ms 14776 KB Output is correct
48 Correct 54 ms 13752 KB Output is correct
49 Correct 59 ms 14664 KB Output is correct
50 Correct 37 ms 12360 KB Output is correct
51 Correct 41 ms 12616 KB Output is correct
52 Correct 35 ms 12104 KB Output is correct
53 Correct 39 ms 12616 KB Output is correct
54 Correct 39 ms 12616 KB Output is correct
55 Correct 35 ms 12368 KB Output is correct
56 Correct 12 ms 8016 KB Output is correct
57 Correct 61 ms 19076 KB Output is correct
58 Correct 37 ms 12040 KB Output is correct
59 Correct 1 ms 336 KB Output is correct
60 Correct 1 ms 504 KB Output is correct
61 Correct 498 ms 74684 KB Output is correct
62 Correct 468 ms 78536 KB Output is correct
63 Correct 473 ms 72372 KB Output is correct
64 Correct 388 ms 65864 KB Output is correct
65 Correct 369 ms 68680 KB Output is correct
66 Correct 350 ms 65624 KB Output is correct
67 Correct 348 ms 66448 KB Output is correct
68 Correct 349 ms 64760 KB Output is correct
69 Correct 370 ms 65352 KB Output is correct
70 Correct 366 ms 62540 KB Output is correct
71 Correct 295 ms 61840 KB Output is correct
72 Correct 322 ms 62120 KB Output is correct
73 Correct 304 ms 62024 KB Output is correct
74 Correct 316 ms 63816 KB Output is correct
75 Correct 350 ms 64008 KB Output is correct
76 Correct 24 ms 15688 KB Output is correct
77 Correct 284 ms 75456 KB Output is correct
78 Correct 252 ms 59208 KB Output is correct
79 Correct 1 ms 336 KB Output is correct
80 Correct 1 ms 336 KB Output is correct