oj.uz

Submission #768678

# Submission time Handle Problem Language Result Execution time Memory
768678 2023-06-28T11:31:22 Z jakobrs Joker (BOI20_joker) C++17
71 / 100
 2000 ms 9156 KB 
#include <algorithm>
#include <iostream>
#include <vector>

using i64 = int64_t;
using i32 = int32_t;

struct Operation {
    i32 l1, r1;
    bool is_bipartite;
};

constexpr i64 root(i64 n) {
    i64 i = 0;
    for (; i * i <= n; i++)
        ;
    return i - 1;
}

class UnionFind {
    std::vector<i32> parent;
    std::vector<i32> sizes;
    std::vector<bool> edge_parity;

    std::vector<Operation> operations;

   public:
    bool is_bipartite = true;

    UnionFind(size_t sz)
        : parent(sz, -1), sizes(sz, 1), edge_parity(sz, false), operations() {}

    template <bool PATH_COMPRESSION>
    i32 find(i32 idx) {
        if (parent[idx] < 0)
            return idx;
        else if constexpr (PATH_COMPRESSION) {
            i64 root = find<PATH_COMPRESSION>(parent[idx]);
            edge_parity[idx] = edge_parity[idx] ^ edge_parity[parent[idx]];
            return parent[idx] = root;
        } else
            return find<PATH_COMPRESSION>(parent[idx]);
    }

    bool parity(i32 idx) {
        if (parent[idx] < 0)
            return false;
        else
            return parity(parent[idx]) ^ edge_parity[idx];
    }

    template <bool PATH_COMPRESSION>
    std::pair<i32, bool> both(i32 idx) {
        if constexpr (PATH_COMPRESSION) {
            return {find<true>(idx), parity(idx)};
        } else {
            // in this case there's an easy iterative version
            bool parity = false;

            while (parent[idx] >= 0) {
                parity = parity ^ edge_parity[idx];
                idx = parent[idx];
            }

            return {idx, parity};
        }
    }

    template <bool PATH_COMPRESSION>
    bool lag_fagforening(i32 l, i32 r) {
        auto [l1, lp] = both<PATH_COMPRESSION>(l);
        auto [r1, rp] = both<PATH_COMPRESSION>(r);

        operations.push_back({
            .l1 = l1,
            .r1 = r1,
            .is_bipartite = is_bipartite,
        });

        if (l1 == r1) {
            return !(is_bipartite &= lp != rp);
        } else {
            if (sizes[l1] < sizes[r1]) {
                std::swap(l1, r1);
                std::swap(lp, rp);
            }

            sizes[l1] += sizes[r1];
            parent[r1] = l1;

            edge_parity[r1] = 1 ^ lp ^ rp;

            return false;
        }
    }

    void tvungen_lønnsnemnd() {
        auto [l1, r1, bpt] = operations.back();
        operations.pop_back();

        if (parent[r1] == l1) {
            parent[r1] = -1;
            sizes[l1] -= sizes[r1];
        } else if (parent[l1] == r1) {
            parent[l1] = -1;
            sizes[r1] -= sizes[l1];
        }

        edge_parity[l1] = edge_parity[r1] = false;

        is_bipartite = bpt;
    }
};

struct {
    template <typename T>
    operator T() const {
        T x;
        std::cin >> x;
        return x;
    }
} in;

#define entire(v) std::begin(v), std::end(v)

#pragma GCC diagnostic ignored "-Wreturn-type"

main() {
    std::cin.tie(nullptr)->sync_with_stdio(false);

    i32 n, m, q;
    std::cin >> n >> m >> q;

    std::vector<std::pair<i32, i32>> edges(m);
    for (i32 i = 0; i < m; i++) {
        edges[i] = {(i32)in - 1, (i32)in - 1};
    }

    UnionFind dsu(n);

    static constexpr i32 root_m = 1024;

    struct Query {
        i32 l, r, i;
    };

    std::vector<Query> queries(q);
    for (i32 i = 0; i < q; i++) queries[i] = {(i32)in - 1, (i32)in, i};

    std::sort(entire(queries), [](auto &&lhs, auto &&rhs) {
        return std::pair<i32, i32>{lhs.l / root_m, -lhs.r} <
               std::pair<i32, i32>{rhs.l / root_m, -rhs.r};
    });

    std::vector<bool> answers(q);

    i32 l = 0;
    i32 r = 0;

    for (i32 start = 0; start < m; start += root_m) {
        l = r;
        while (r < q && queries[r].l < start + root_m) r++;

        i32 w = m;
        for (i32 i = l; i < r; i++) {
            for (i32 o = queries[i].r; o < w; o++)
                dsu.lag_fagforening<false>(edges[o].first, edges[o].second);
            w = queries[i].r;

            for (i32 g = start; g < queries[i].l; g++)
                dsu.lag_fagforening<false>(edges[g].first, edges[g].second);

            answers[queries[i].i] = dsu.is_bipartite;

            for (i32 g = start; g < queries[i].l; g++) dsu.tvungen_lønnsnemnd();
        }

        for (i32 x = w; x < m; x++) dsu.tvungen_lønnsnemnd();

        for (i32 y = start; y < start + root_m && y < m; y++)
            dsu.lag_fagforening<true>(edges[y].first, edges[y].second);
    }

    for (auto x : answers) {
        std::cout << (x ? "NO\n" : "YES\n");
    }
}

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 1 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 1 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 18 ms 340 KB Output is correct
30 Correct 17 ms 420 KB Output is correct
31 Correct 21 ms 416 KB Output is correct
32 Correct 17 ms 408 KB Output is correct
33 Correct 17 ms 420 KB Output is correct
34 Correct 16 ms 340 KB Output is correct
35 Correct 16 ms 424 KB Output is correct
36 Correct 17 ms 416 KB Output is correct
37 Correct 15 ms 424 KB Output is correct
38 Correct 16 ms 416 KB Output is correct
39 Correct 16 ms 340 KB Output is correct
40 Correct 19 ms 412 KB Output is correct
41 Correct 17 ms 420 KB Output is correct
42 Correct 17 ms 416 KB Output is correct
43 Correct 18 ms 408 KB Output is correct
44 Correct 18 ms 404 KB Output is correct
45 Correct 17 ms 416 KB Output is correct
46 Correct 18 ms 424 KB Output is correct
47 Correct 17 ms 408 KB Output is correct
48 Correct 17 ms 416 KB Output is correct
49 Correct 16 ms 424 KB Output is correct
50 Correct 16 ms 420 KB Output is correct
51 Correct 17 ms 416 KB Output is correct
52 Correct 19 ms 416 KB Output is correct
53 Correct 18 ms 424 KB Output is correct
54 Correct 18 ms 428 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 68 ms 8220 KB Output is correct
4 Correct 69 ms 9024 KB Output is correct
5 Correct 78 ms 8848 KB Output is correct
6 Correct 70 ms 8156 KB Output is correct
7 Correct 72 ms 8220 KB Output is correct
8 Correct 67 ms 7896 KB Output is correct
9 Correct 68 ms 8276 KB Output is correct
10 Correct 73 ms 9032 KB Output is correct
11 Correct 72 ms 8148 KB Output is correct
12 Correct 74 ms 8784 KB Output is correct
13 Correct 68 ms 7508 KB Output is correct
14 Correct 70 ms 7856 KB Output is correct
15 Correct 75 ms 8536 KB Output is correct
16 Correct 77 ms 8992 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 1 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 68 ms 8220 KB Output is correct
30 Correct 69 ms 9024 KB Output is correct
31 Correct 78 ms 8848 KB Output is correct
32 Correct 70 ms 8156 KB Output is correct
33 Correct 72 ms 8220 KB Output is correct
34 Correct 67 ms 7896 KB Output is correct
35 Correct 68 ms 8276 KB Output is correct
36 Correct 73 ms 9032 KB Output is correct
37 Correct 72 ms 8148 KB Output is correct
38 Correct 74 ms 8784 KB Output is correct
39 Correct 68 ms 7508 KB Output is correct
40 Correct 70 ms 7856 KB Output is correct
41 Correct 75 ms 8536 KB Output is correct
42 Correct 77 ms 8992 KB Output is correct
43 Correct 378 ms 8160 KB Output is correct
44 Correct 389 ms 9008 KB Output is correct
45 Correct 385 ms 9156 KB Output is correct
46 Correct 404 ms 8268 KB Output is correct
47 Correct 413 ms 8228 KB Output is correct
48 Correct 461 ms 8304 KB Output is correct
49 Correct 466 ms 9040 KB Output is correct
50 Correct 377 ms 8060 KB Output is correct
51 Correct 390 ms 8540 KB Output is correct
52 Correct 388 ms 9088 KB Output is correct
53 Correct 416 ms 7588 KB Output is correct
54 Correct 450 ms 8100 KB Output is correct
55 Correct 434 ms 8572 KB Output is correct
56 Correct 441 ms 9012 KB Output is correct

Subtask #5
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 1 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 18 ms 340 KB Output is correct
30 Correct 17 ms 420 KB Output is correct
31 Correct 21 ms 416 KB Output is correct
32 Correct 17 ms 408 KB Output is correct
33 Correct 17 ms 420 KB Output is correct
34 Correct 16 ms 340 KB Output is correct
35 Correct 16 ms 424 KB Output is correct
36 Correct 17 ms 416 KB Output is correct
37 Correct 15 ms 424 KB Output is correct
38 Correct 16 ms 416 KB Output is correct
39 Correct 16 ms 340 KB Output is correct
40 Correct 19 ms 412 KB Output is correct
41 Correct 17 ms 420 KB Output is correct
42 Correct 17 ms 416 KB Output is correct
43 Correct 18 ms 408 KB Output is correct
44 Correct 18 ms 404 KB Output is correct
45 Correct 17 ms 416 KB Output is correct
46 Correct 18 ms 424 KB Output is correct
47 Correct 17 ms 408 KB Output is correct
48 Correct 17 ms 416 KB Output is correct
49 Correct 16 ms 424 KB Output is correct
50 Correct 16 ms 420 KB Output is correct
51 Correct 17 ms 416 KB Output is correct
52 Correct 19 ms 416 KB Output is correct
53 Correct 18 ms 424 KB Output is correct
54 Correct 18 ms 428 KB Output is correct
55 Correct 342 ms 5832 KB Output is correct
56 Correct 622 ms 6608 KB Output is correct
57 Correct 459 ms 6468 KB Output is correct
58 Correct 442 ms 5824 KB Output is correct
59 Correct 730 ms 5900 KB Output is correct
60 Correct 898 ms 6364 KB Output is correct
61 Correct 503 ms 5824 KB Output is correct
62 Correct 614 ms 6468 KB Output is correct
63 Correct 364 ms 5444 KB Output is correct
64 Correct 580 ms 5984 KB Output is correct
65 Correct 658 ms 6536 KB Output is correct

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 1 ms 212 KB Output is correct
23 Correct 1 ms 212 KB Output is correct
24 Correct 1 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 18 ms 340 KB Output is correct
30 Correct 17 ms 420 KB Output is correct
31 Correct 21 ms 416 KB Output is correct
32 Correct 17 ms 408 KB Output is correct
33 Correct 17 ms 420 KB Output is correct
34 Correct 16 ms 340 KB Output is correct
35 Correct 16 ms 424 KB Output is correct
36 Correct 17 ms 416 KB Output is correct
37 Correct 15 ms 424 KB Output is correct
38 Correct 16 ms 416 KB Output is correct
39 Correct 16 ms 340 KB Output is correct
40 Correct 19 ms 412 KB Output is correct
41 Correct 17 ms 420 KB Output is correct
42 Correct 17 ms 416 KB Output is correct
43 Correct 18 ms 408 KB Output is correct
44 Correct 18 ms 404 KB Output is correct
45 Correct 17 ms 416 KB Output is correct
46 Correct 18 ms 424 KB Output is correct
47 Correct 17 ms 408 KB Output is correct
48 Correct 17 ms 416 KB Output is correct
49 Correct 16 ms 424 KB Output is correct
50 Correct 16 ms 420 KB Output is correct
51 Correct 17 ms 416 KB Output is correct
52 Correct 19 ms 416 KB Output is correct
53 Correct 18 ms 424 KB Output is correct
54 Correct 18 ms 428 KB Output is correct
55 Correct 68 ms 8220 KB Output is correct
56 Correct 69 ms 9024 KB Output is correct
57 Correct 78 ms 8848 KB Output is correct
58 Correct 70 ms 8156 KB Output is correct
59 Correct 72 ms 8220 KB Output is correct
60 Correct 67 ms 7896 KB Output is correct
61 Correct 68 ms 8276 KB Output is correct
62 Correct 73 ms 9032 KB Output is correct
63 Correct 72 ms 8148 KB Output is correct
64 Correct 74 ms 8784 KB Output is correct
65 Correct 68 ms 7508 KB Output is correct
66 Correct 70 ms 7856 KB Output is correct
67 Correct 75 ms 8536 KB Output is correct
68 Correct 77 ms 8992 KB Output is correct
69 Correct 378 ms 8160 KB Output is correct
70 Correct 389 ms 9008 KB Output is correct
71 Correct 385 ms 9156 KB Output is correct
72 Correct 404 ms 8268 KB Output is correct
73 Correct 413 ms 8228 KB Output is correct
74 Correct 461 ms 8304 KB Output is correct
75 Correct 466 ms 9040 KB Output is correct
76 Correct 377 ms 8060 KB Output is correct
77 Correct 390 ms 8540 KB Output is correct
78 Correct 388 ms 9088 KB Output is correct
79 Correct 416 ms 7588 KB Output is correct
80 Correct 450 ms 8100 KB Output is correct
81 Correct 434 ms 8572 KB Output is correct
82 Correct 441 ms 9012 KB Output is correct
83 Correct 342 ms 5832 KB Output is correct
84 Correct 622 ms 6608 KB Output is correct
85 Correct 459 ms 6468 KB Output is correct
86 Correct 442 ms 5824 KB Output is correct
87 Correct 730 ms 5900 KB Output is correct
88 Correct 898 ms 6364 KB Output is correct
89 Correct 503 ms 5824 KB Output is correct
90 Correct 614 ms 6468 KB Output is correct
91 Correct 364 ms 5444 KB Output is correct
92 Correct 580 ms 5984 KB Output is correct
93 Correct 658 ms 6536 KB Output is correct
94 Execution timed out 2069 ms 8220 KB Time limit exceeded
95 Halted 0 ms 0 KB -