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Submission #1049670

# Submission time Handle Problem Language Result Execution time Memory
1049670 2024-08-09T03:46:14 Z shiomusubi496 Joker (BOI20_joker) C++17
71 / 100
 2000 ms 24256 KB 
#include <bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define rep2(i, a, b) for (int i = (int)(a); i < (int)(b); ++i)
#define rrep(i, n) for (int i = (int)(n) - 1; i >= 0; --i)
#define rrep2(i, a, b) for (int i = (int)(b) - 1; i >= (int)(a); --i)
#define all(v) begin(v), end(v)
#define rall(v) rbegin(v), rend(v)

using namespace std;

using ll = long long;

template<class T, class U> bool chmin(T& a, const U& b) { return a > b ? a = b, true : false; }
template<class T, class U> bool chmax(T& a, const U& b) { return a < b ? a = b, true : false; }

class UndoableUF {
    int n;
    bool flag = true;
    vector<int> par;
    vector<tuple<int, int, bool>> history;

public:
    UndoableUF(int n_) : n(n_ / 2), par(n_, -1) {}
    int find(int x) { return par[x] < 0 ? x : find(par[x]); }
    bool merge(int x, int y) {
        x = find(x), y = find(y);
        history.emplace_back(x, par[x], flag);
        history.emplace_back(y, par[y], flag);
        if (x == y) return false;
        if (par[x] > par[y]) swap(x, y);
        par[x] += par[y];
        par[y] = x;
        if (same(x, (x + n) % (2 * n))) flag = false;
        return true;
    }
    bool same(int x, int y) { return find(x) == find(y); }
    void undo() {
        auto [x, px, _] = history.back(); history.pop_back();
        auto [y, py, f] = history.back(); history.pop_back();
        par[x] = px;
        par[y] = py;
        flag = f;
    }
    void snapshot() { history.clear(); }
    void rollback() {
        while (!history.empty()) undo();
    }
    bool is_bip() { return flag; }
};

int main() {
    int N, M, Q; cin >> N >> M >> Q;
    vector<pair<int, int>> A(M);
    rep (i, M) {
        cin >> A[i].first >> A[i].second;
        --A[i].first, --A[i].second;
    }
    vector<array<int, 3>> B(Q);
    rep (i, Q) {
        cin >> B[i][0] >> B[i][1];
        --B[i][0];
        B[i][2] = i;
    }
    int block = M / sqrt(Q);
    sort(all(B), [&](auto a, auto b) {
        if (a[0] / block != b[0] / block) return a[0] < b[0];
        return a[1] > b[1];
    });
    vector<bool> ans(Q);
    int curl = block, curr = M;
    UndoableUF uf(2 * N);
    for (auto [l, r, k] : B) {
        while (curl <= l) {
            uf.rollback();
            rep2 (i, curl - block, curl) {
                if (i >= M) break;
                uf.merge(A[i].first, A[i].second + N);
                uf.merge(A[i].first + N, A[i].second);
            }
            uf.snapshot();
            curl += block;
            curr = M;
        }
        assert(curr >= r);
        rrep2 (i, r, curr) {
            uf.merge(A[i].first, A[i].second + N);
            uf.merge(A[i].first + N, A[i].second);
        }
        curr = r;
        rep2 (i, curl - block, l) {
            uf.merge(A[i].first, A[i].second + N);
            uf.merge(A[i].first + N, A[i].second);
        }
        ans[k] = uf.is_bip();
        rep2 (i, curl - block, l) uf.undo(), uf.undo();
    }
    rep (i, Q) puts(ans[i] ? "NO" : "YES");
}

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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 600 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 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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 600 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 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 2 ms 348 KB Output is correct
30 Correct 3 ms 604 KB Output is correct
31 Correct 3 ms 664 KB Output is correct
32 Correct 3 ms 604 KB Output is correct
33 Correct 3 ms 472 KB Output is correct
34 Correct 3 ms 676 KB Output is correct
35 Correct 4 ms 604 KB Output is correct
36 Correct 2 ms 604 KB Output is correct
37 Correct 3 ms 604 KB Output is correct
38 Correct 3 ms 680 KB Output is correct
39 Correct 3 ms 604 KB Output is correct
40 Correct 3 ms 604 KB Output is correct
41 Correct 3 ms 604 KB Output is correct
42 Correct 3 ms 604 KB Output is correct
43 Correct 3 ms 604 KB Output is correct
44 Correct 3 ms 604 KB Output is correct
45 Correct 4 ms 600 KB Output is correct
46 Correct 4 ms 476 KB Output is correct
47 Correct 3 ms 604 KB Output is correct
48 Correct 3 ms 604 KB Output is correct
49 Correct 3 ms 604 KB Output is correct
50 Correct 3 ms 604 KB Output is correct
51 Correct 3 ms 604 KB Output is correct
52 Correct 3 ms 604 KB Output is correct
53 Correct 3 ms 604 KB Output is correct
54 Correct 3 ms 604 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 125 ms 17468 KB Output is correct
4 Correct 117 ms 18368 KB Output is correct
5 Correct 127 ms 19392 KB Output is correct
6 Correct 121 ms 19292 KB Output is correct
7 Correct 141 ms 17852 KB Output is correct
8 Correct 125 ms 17724 KB Output is correct
9 Correct 114 ms 19388 KB Output is correct
10 Correct 124 ms 19904 KB Output is correct
11 Correct 119 ms 17596 KB Output is correct
12 Correct 124 ms 18876 KB Output is correct
13 Correct 118 ms 17340 KB Output is correct
14 Correct 132 ms 18480 KB Output is correct
15 Correct 125 ms 19388 KB Output is correct
16 Correct 128 ms 20060 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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 600 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 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 125 ms 17468 KB Output is correct
30 Correct 117 ms 18368 KB Output is correct
31 Correct 127 ms 19392 KB Output is correct
32 Correct 121 ms 19292 KB Output is correct
33 Correct 141 ms 17852 KB Output is correct
34 Correct 125 ms 17724 KB Output is correct
35 Correct 114 ms 19388 KB Output is correct
36 Correct 124 ms 19904 KB Output is correct
37 Correct 119 ms 17596 KB Output is correct
38 Correct 124 ms 18876 KB Output is correct
39 Correct 118 ms 17340 KB Output is correct
40 Correct 132 ms 18480 KB Output is correct
41 Correct 125 ms 19388 KB Output is correct
42 Correct 128 ms 20060 KB Output is correct
43 Correct 426 ms 20652 KB Output is correct
44 Correct 442 ms 21588 KB Output is correct
45 Correct 439 ms 21820 KB Output is correct
46 Correct 433 ms 21688 KB Output is correct
47 Correct 486 ms 20184 KB Output is correct
48 Correct 502 ms 20356 KB Output is correct
49 Correct 558 ms 20924 KB Output is correct
50 Correct 411 ms 21116 KB Output is correct
51 Correct 438 ms 21104 KB Output is correct
52 Correct 447 ms 21940 KB Output is correct
53 Correct 413 ms 21088 KB Output is correct
54 Correct 579 ms 20232 KB Output is correct
55 Correct 571 ms 18108 KB Output is correct
56 Correct 541 ms 18360 KB Output is correct

Subtask #5
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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 600 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 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 2 ms 348 KB Output is correct
30 Correct 3 ms 604 KB Output is correct
31 Correct 3 ms 664 KB Output is correct
32 Correct 3 ms 604 KB Output is correct
33 Correct 3 ms 472 KB Output is correct
34 Correct 3 ms 676 KB Output is correct
35 Correct 4 ms 604 KB Output is correct
36 Correct 2 ms 604 KB Output is correct
37 Correct 3 ms 604 KB Output is correct
38 Correct 3 ms 680 KB Output is correct
39 Correct 3 ms 604 KB Output is correct
40 Correct 3 ms 604 KB Output is correct
41 Correct 3 ms 604 KB Output is correct
42 Correct 3 ms 604 KB Output is correct
43 Correct 3 ms 604 KB Output is correct
44 Correct 3 ms 604 KB Output is correct
45 Correct 4 ms 600 KB Output is correct
46 Correct 4 ms 476 KB Output is correct
47 Correct 3 ms 604 KB Output is correct
48 Correct 3 ms 604 KB Output is correct
49 Correct 3 ms 604 KB Output is correct
50 Correct 3 ms 604 KB Output is correct
51 Correct 3 ms 604 KB Output is correct
52 Correct 3 ms 604 KB Output is correct
53 Correct 3 ms 604 KB Output is correct
54 Correct 3 ms 604 KB Output is correct
55 Correct 223 ms 17088 KB Output is correct
56 Correct 296 ms 18368 KB Output is correct
57 Correct 317 ms 16064 KB Output is correct
58 Correct 363 ms 17088 KB Output is correct
59 Correct 480 ms 17084 KB Output is correct
60 Correct 507 ms 18624 KB Output is correct
61 Correct 308 ms 18720 KB Output is correct
62 Correct 384 ms 20160 KB Output is correct
63 Correct 367 ms 16900 KB Output is correct
64 Correct 471 ms 18352 KB Output is correct
65 Correct 498 ms 20248 KB Output is correct

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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 600 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 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 2 ms 348 KB Output is correct
30 Correct 3 ms 604 KB Output is correct
31 Correct 3 ms 664 KB Output is correct
32 Correct 3 ms 604 KB Output is correct
33 Correct 3 ms 472 KB Output is correct
34 Correct 3 ms 676 KB Output is correct
35 Correct 4 ms 604 KB Output is correct
36 Correct 2 ms 604 KB Output is correct
37 Correct 3 ms 604 KB Output is correct
38 Correct 3 ms 680 KB Output is correct
39 Correct 3 ms 604 KB Output is correct
40 Correct 3 ms 604 KB Output is correct
41 Correct 3 ms 604 KB Output is correct
42 Correct 3 ms 604 KB Output is correct
43 Correct 3 ms 604 KB Output is correct
44 Correct 3 ms 604 KB Output is correct
45 Correct 4 ms 600 KB Output is correct
46 Correct 4 ms 476 KB Output is correct
47 Correct 3 ms 604 KB Output is correct
48 Correct 3 ms 604 KB Output is correct
49 Correct 3 ms 604 KB Output is correct
50 Correct 3 ms 604 KB Output is correct
51 Correct 3 ms 604 KB Output is correct
52 Correct 3 ms 604 KB Output is correct
53 Correct 3 ms 604 KB Output is correct
54 Correct 3 ms 604 KB Output is correct
55 Correct 125 ms 17468 KB Output is correct
56 Correct 117 ms 18368 KB Output is correct
57 Correct 127 ms 19392 KB Output is correct
58 Correct 121 ms 19292 KB Output is correct
59 Correct 141 ms 17852 KB Output is correct
60 Correct 125 ms 17724 KB Output is correct
61 Correct 114 ms 19388 KB Output is correct
62 Correct 124 ms 19904 KB Output is correct
63 Correct 119 ms 17596 KB Output is correct
64 Correct 124 ms 18876 KB Output is correct
65 Correct 118 ms 17340 KB Output is correct
66 Correct 132 ms 18480 KB Output is correct
67 Correct 125 ms 19388 KB Output is correct
68 Correct 128 ms 20060 KB Output is correct
69 Correct 426 ms 20652 KB Output is correct
70 Correct 442 ms 21588 KB Output is correct
71 Correct 439 ms 21820 KB Output is correct
72 Correct 433 ms 21688 KB Output is correct
73 Correct 486 ms 20184 KB Output is correct
74 Correct 502 ms 20356 KB Output is correct
75 Correct 558 ms 20924 KB Output is correct
76 Correct 411 ms 21116 KB Output is correct
77 Correct 438 ms 21104 KB Output is correct
78 Correct 447 ms 21940 KB Output is correct
79 Correct 413 ms 21088 KB Output is correct
80 Correct 579 ms 20232 KB Output is correct
81 Correct 571 ms 18108 KB Output is correct
82 Correct 541 ms 18360 KB Output is correct
83 Correct 223 ms 17088 KB Output is correct
84 Correct 296 ms 18368 KB Output is correct
85 Correct 317 ms 16064 KB Output is correct
86 Correct 363 ms 17088 KB Output is correct
87 Correct 480 ms 17084 KB Output is correct
88 Correct 507 ms 18624 KB Output is correct
89 Correct 308 ms 18720 KB Output is correct
90 Correct 384 ms 20160 KB Output is correct
91 Correct 367 ms 16900 KB Output is correct
92 Correct 471 ms 18352 KB Output is correct
93 Correct 498 ms 20248 KB Output is correct
94 Correct 1738 ms 24256 KB Output is correct
95 Execution timed out 2049 ms 23996 KB Time limit exceeded
96 Halted 0 ms 0 KB -