Submission #898453

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
898453	2024-01-04T16:48:46 Z	GrandTiger1729	Joker (BOI20_joker)	C++17	14 / 100	2000 ms	6704 KB

Joker

#include <bits/stdc++.h>
using namespace std;

struct DSU
{
    vector<int> rt, sz;
    vector<int> stk;
    DSU(int n)
    {
        rt.resize(n);
        iota(rt.begin(), rt.end(), 0);
        sz.resize(n, 1);
    }
    int find(int u)
    {
        if (u == rt[u])
        {
            return u;
        }
        return find(rt[u]);
    }
    bool same(int u, int v)
    {
        return find(u) == find(v);
    }
    void unite(int u, int v)
    {
        u = find(u), v = find(v);
        if (u == v)
        {
            stk.push_back(-1);
            return;
        }
        if (sz[u] > sz[v])
        {
            swap(u, v);
        }
        rt[u] = v;
        sz[v] += sz[u];
        stk.push_back(u);
    }
    void undo()
    {
        int u = stk.back();
        stk.pop_back();
        if (u == -1)
        {
            return;
        }
        int v = rt[u];
        sz[v] -= sz[u];
        rt[u] = u;
    }
};

const int B = 1, C = 3, D = 1;
int main()
{
    cin.tie(0)->sync_with_stdio(0);
    int n, m, q;
    cin >> n >> m >> q;
    vector<pair<int, int>> ed(m);
    for (int i = 0; i < m; i++)
    {
        int u, v;
        cin >> u >> v;
        u--, v--;
        ed[i] = make_pair(u, v);
    }
    vector<int> rr(m, -1);
    for (int c = 0; c * C * B < m; c++)
    {
        int L1 = c * C * B, L2 = min(m, (c + 1) * C * B);
        int R = -1;
        DSU dsu(2 * n);
        {
            for (int i = 0; i < L1; i++)
            {
                auto [u, v] = ed[i];
                dsu.unite(u, v + n);
                dsu.unite(u + n, v);
                if (dsu.same(u, v))
                {
                    R = i;
                    break;
                }
            }
            if (R != -1)
            {
                break;
            }
            for (int i = L1; i < L2; i++)
            {
                auto [u, v] = ed[i];
                dsu.unite(u, v + n);
                dsu.unite(u + n, v);
                if (dsu.same(u, v))
                {
                    R = i;
                    break;
                }
            }
            if (R == -1)
            {
                R = m - 1;
                while (R >= L2)
                {
                    auto [u, v] = ed[R];
                    dsu.unite(u, v + n);
                    dsu.unite(u + n, v);
                    if (dsu.same(u, v))
                    {
                        dsu.undo();
                        dsu.undo();
                        break;
                    }
                    R--;
                }
                for (int i = m - 1; i > R; i--)
                {
                    dsu.undo();
                    dsu.undo();
                }
                for (int i = L1; i < L2; i++)
                {
                    dsu.undo();
                    dsu.undo();
                }
            }
            else
            {
                for (int i = L1; i <= R; i++)
                {
                    dsu.undo();
                    dsu.undo();
                }
                R = m - 1;
            }
            for (int i = m - 1; i > R; i--)
            {
                auto [u, v] = ed[i];
                dsu.unite(u, v + n);
                dsu.unite(u + n, v);
            }
        }
        for (int d = (L2 - 1 - L1) / (B * D); d >= 0; d--)
        {
            int ll1 = L1 + d * B * D, ll2 = min(L2, ll1 + B * D);
            int r2 = -1;
            for (int i = L1; i < ll1; i++)
            {
                auto [u, v] = ed[i];
                dsu.unite(u, v + n);
                dsu.unite(u + n, v);
                if (dsu.same(u, v))
                {
                    r2 = i;
                    break;
                }
            }
            if (r2 != -1)
            {
                for (int i = L1; i <= r2; i++)
                {
                    dsu.undo();
                    dsu.undo();
                }
                continue;
            }
            for (int i = ll1; i < ll2; i++)
            {
                auto [u, v] = ed[i];
                dsu.unite(u, v + n);
                dsu.unite(u + n, v);
            }
            r2 = R;
            for (int b = (ll2 - 1 - ll1) / B; b >= 0; b--)
            {
                int l1 = ll1 + b * B, l2 = min(ll2, l1 + B);
                for (int i = l1; i < l2; i++)
                {
                    dsu.undo();
                    dsu.undo();
                }
                for (int i = R; i > r2; i--)
                {
                    auto [u, v] = ed[i];
                    dsu.unite(u, v + n);
                    dsu.unite(u + n, v);
                }
                int r = r2;
                bool f = 0;
                for (int i = r; i >= l1; i--)
                {
                    int l = l1;
                    while (l < l2 && l <= i)
                    {
                        auto [u, v] = ed[l];
                        dsu.unite(u, v + n);
                        dsu.unite(u + n, v);
                        if (dsu.same(u, v))
                        {
                            break;
                        }
                        l++;
                    }
                    rr[i] = max(rr[i], l);
                    l = min(l, l2 - 1);
                    l = min(l, i);
                    for (int j = l1; j <= l; j++)
                    {
                        dsu.undo();
                        dsu.undo();
                    }
                    auto [u, v] = ed[i];
                    dsu.unite(u, v + n);
                    dsu.unite(u + n, v);
                    if (dsu.same(u, v))
                    {
                        r2 = i;
                        f = 1;
                        break;
                    }
                }
                if (!f)
                {
                    r2 = l1;
                }
                for (int i = r2; i <= R; i++)
                {
                    dsu.undo();
                    dsu.undo();
                }
            }
            for (int i = L1; i < ll1; i++)
            {
                dsu.undo();
                dsu.undo();
            }
            for (int i = r2 + 1; i <= R; i++)
            {
                auto [u, v] = ed[i];
                dsu.unite(u, v + n);
                dsu.unite(u + n, v);
            }
            R = r2;
        }
    }
    while (q--)
    {
        int l, r;
        cin >> l >> r;
        l--, r--;
        cout << (rr[r] >= l ? "NO" : "YES") << '\n';
    }
    return 0;
}

Subtask #1
6.0 / 6.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	348 KB	Output is correct
11	Correct	1 ms	344 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	1 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	1 ms	424 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct
18	Correct	0 ms	344 KB	Output is correct
19	Correct	0 ms	344 KB	Output is correct
20	Correct	0 ms	348 KB	Output is correct
21	Correct	0 ms	348 KB	Output is correct
22	Correct	1 ms	348 KB	Output is correct
23	Correct	1 ms	348 KB	Output is correct
24	Correct	1 ms	348 KB	Output is correct
25	Correct	0 ms	348 KB	Output is correct
26	Correct	1 ms	348 KB	Output is correct
27	Correct	1 ms	348 KB	Output is correct
28	Correct	1 ms	348 KB	Output is correct

Subtask #2
8.0 / 8.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	348 KB	Output is correct
11	Correct	1 ms	344 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	1 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	1 ms	424 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct
18	Correct	0 ms	344 KB	Output is correct
19	Correct	0 ms	344 KB	Output is correct
20	Correct	0 ms	348 KB	Output is correct
21	Correct	0 ms	348 KB	Output is correct
22	Correct	1 ms	348 KB	Output is correct
23	Correct	1 ms	348 KB	Output is correct
24	Correct	1 ms	348 KB	Output is correct
25	Correct	0 ms	348 KB	Output is correct
26	Correct	1 ms	348 KB	Output is correct
27	Correct	1 ms	348 KB	Output is correct
28	Correct	1 ms	348 KB	Output is correct
29	Correct	7 ms	348 KB	Output is correct
30	Correct	11 ms	536 KB	Output is correct
31	Correct	6 ms	344 KB	Output is correct
32	Correct	3 ms	348 KB	Output is correct
33	Correct	2 ms	348 KB	Output is correct
34	Correct	5 ms	348 KB	Output is correct
35	Correct	9 ms	348 KB	Output is correct
36	Correct	9 ms	604 KB	Output is correct
37	Correct	20 ms	348 KB	Output is correct
38	Correct	25 ms	348 KB	Output is correct
39	Correct	13 ms	344 KB	Output is correct
40	Correct	4 ms	348 KB	Output is correct
41	Correct	3 ms	348 KB	Output is correct
42	Correct	3 ms	348 KB	Output is correct
43	Correct	4 ms	348 KB	Output is correct
44	Correct	5 ms	348 KB	Output is correct
45	Correct	5 ms	348 KB	Output is correct
46	Correct	9 ms	348 KB	Output is correct
47	Correct	5 ms	348 KB	Output is correct
48	Correct	7 ms	344 KB	Output is correct
49	Correct	6 ms	348 KB	Output is correct
50	Correct	7 ms	348 KB	Output is correct
51	Correct	5 ms	344 KB	Output is correct
52	Correct	5 ms	512 KB	Output is correct
53	Correct	6 ms	348 KB	Output is correct
54	Correct	8 ms	540 KB	Output is correct

Subtask #3
0 / 25.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Execution timed out	2052 ms	6704 KB	Time limit exceeded
4	Halted	0 ms	0 KB	-

Subtask #4
0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	348 KB	Output is correct
11	Correct	1 ms	344 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	1 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	1 ms	424 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct
18	Correct	0 ms	344 KB	Output is correct
19	Correct	0 ms	344 KB	Output is correct
20	Correct	0 ms	348 KB	Output is correct
21	Correct	0 ms	348 KB	Output is correct
22	Correct	1 ms	348 KB	Output is correct
23	Correct	1 ms	348 KB	Output is correct
24	Correct	1 ms	348 KB	Output is correct
25	Correct	0 ms	348 KB	Output is correct
26	Correct	1 ms	348 KB	Output is correct
27	Correct	1 ms	348 KB	Output is correct
28	Correct	1 ms	348 KB	Output is correct
29	Execution timed out	2052 ms	6704 KB	Time limit exceeded
30	Halted	0 ms	0 KB	-

Subtask #5
0 / 22.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	348 KB	Output is correct
11	Correct	1 ms	344 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	1 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	1 ms	424 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct
18	Correct	0 ms	344 KB	Output is correct
19	Correct	0 ms	344 KB	Output is correct
20	Correct	0 ms	348 KB	Output is correct
21	Correct	0 ms	348 KB	Output is correct
22	Correct	1 ms	348 KB	Output is correct
23	Correct	1 ms	348 KB	Output is correct
24	Correct	1 ms	348 KB	Output is correct
25	Correct	0 ms	348 KB	Output is correct
26	Correct	1 ms	348 KB	Output is correct
27	Correct	1 ms	348 KB	Output is correct
28	Correct	1 ms	348 KB	Output is correct
29	Correct	7 ms	348 KB	Output is correct
30	Correct	11 ms	536 KB	Output is correct
31	Correct	6 ms	344 KB	Output is correct
32	Correct	3 ms	348 KB	Output is correct
33	Correct	2 ms	348 KB	Output is correct
34	Correct	5 ms	348 KB	Output is correct
35	Correct	9 ms	348 KB	Output is correct
36	Correct	9 ms	604 KB	Output is correct
37	Correct	20 ms	348 KB	Output is correct
38	Correct	25 ms	348 KB	Output is correct
39	Correct	13 ms	344 KB	Output is correct
40	Correct	4 ms	348 KB	Output is correct
41	Correct	3 ms	348 KB	Output is correct
42	Correct	3 ms	348 KB	Output is correct
43	Correct	4 ms	348 KB	Output is correct
44	Correct	5 ms	348 KB	Output is correct
45	Correct	5 ms	348 KB	Output is correct
46	Correct	9 ms	348 KB	Output is correct
47	Correct	5 ms	348 KB	Output is correct
48	Correct	7 ms	344 KB	Output is correct
49	Correct	6 ms	348 KB	Output is correct
50	Correct	7 ms	348 KB	Output is correct
51	Correct	5 ms	344 KB	Output is correct
52	Correct	5 ms	512 KB	Output is correct
53	Correct	6 ms	348 KB	Output is correct
54	Correct	8 ms	540 KB	Output is correct
55	Execution timed out	2017 ms	6572 KB	Time limit exceeded
56	Halted	0 ms	0 KB	-

Subtask #6
0 / 29.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	344 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	348 KB	Output is correct
11	Correct	1 ms	344 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct
13	Correct	0 ms	348 KB	Output is correct
14	Correct	1 ms	348 KB	Output is correct
15	Correct	1 ms	348 KB	Output is correct
16	Correct	1 ms	424 KB	Output is correct
17	Correct	0 ms	348 KB	Output is correct
18	Correct	0 ms	344 KB	Output is correct
19	Correct	0 ms	344 KB	Output is correct
20	Correct	0 ms	348 KB	Output is correct
21	Correct	0 ms	348 KB	Output is correct
22	Correct	1 ms	348 KB	Output is correct
23	Correct	1 ms	348 KB	Output is correct
24	Correct	1 ms	348 KB	Output is correct
25	Correct	0 ms	348 KB	Output is correct
26	Correct	1 ms	348 KB	Output is correct
27	Correct	1 ms	348 KB	Output is correct
28	Correct	1 ms	348 KB	Output is correct
29	Correct	7 ms	348 KB	Output is correct
30	Correct	11 ms	536 KB	Output is correct
31	Correct	6 ms	344 KB	Output is correct
32	Correct	3 ms	348 KB	Output is correct
33	Correct	2 ms	348 KB	Output is correct
34	Correct	5 ms	348 KB	Output is correct
35	Correct	9 ms	348 KB	Output is correct
36	Correct	9 ms	604 KB	Output is correct
37	Correct	20 ms	348 KB	Output is correct
38	Correct	25 ms	348 KB	Output is correct
39	Correct	13 ms	344 KB	Output is correct
40	Correct	4 ms	348 KB	Output is correct
41	Correct	3 ms	348 KB	Output is correct
42	Correct	3 ms	348 KB	Output is correct
43	Correct	4 ms	348 KB	Output is correct
44	Correct	5 ms	348 KB	Output is correct
45	Correct	5 ms	348 KB	Output is correct
46	Correct	9 ms	348 KB	Output is correct
47	Correct	5 ms	348 KB	Output is correct
48	Correct	7 ms	344 KB	Output is correct
49	Correct	6 ms	348 KB	Output is correct
50	Correct	7 ms	348 KB	Output is correct
51	Correct	5 ms	344 KB	Output is correct
52	Correct	5 ms	512 KB	Output is correct
53	Correct	6 ms	348 KB	Output is correct
54	Correct	8 ms	540 KB	Output is correct
55	Execution timed out	2052 ms	6704 KB	Time limit exceeded
56	Halted	0 ms	0 KB	-

Submission #898453

Compilation message

Subtask #1 6.0 / 6.0

Subtask #2 8.0 / 8.0

Subtask #3 0 / 25.0

Subtask #4 0 / 10.0

Subtask #5 0 / 22.0

Subtask #6 0 / 29.0

Subtask #1
6.0 / 6.0

Subtask #2
8.0 / 8.0

Subtask #3
0 / 25.0

Subtask #4
0 / 10.0

Subtask #5
0 / 22.0

Subtask #6
0 / 29.0