oj.uz

Submission #986443

# Submission time Handle Problem Language Result Execution time Memory
986443 2024-05-20T14:47:21 Z tfgs Joker (BOI20_joker) C++17
14 / 100
 640 ms 72492 KB 
#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
#include "algo/debug.h"
#endif

#define f first
#define s second
template<class T> using V = vector<T>; 
using vi = V<int>;
using vb = V<bool>;
using vs = V<string>;

#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x) 
#define pb push_back
#define lb lower_bound
#define ub upper_bound
template<class T> int lwb(V<T>& a, const T& b) { return lb(all(a),b)-begin(a); }
template<class T> int upb(V<T>& a, const T& b) { return ub(all(a),b)-begin(a); }
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a=b, true : false; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a=b, true : false; }
#define ASSERT(exp) do { if (!(exp)) while (true); } while(0)

const int K = 1.8e4, max_n = 2e5, max_q = 2000;
struct query {
    int l, r, ind;
    bool operator <(const query& o) const {
        if (l/K == o.l/K) return r > o.r;
        return l/K < o.l/K;
    }
};
V<query> queries[(max_n-1)/K + 1];
int n, m, q, ans[max_q];
array<int, 2> edges[max_n];

array<int, 2> par[max_n];
int rnk[max_n];
void make_set(int u) {
    par[u] = {u, 0};
    rnk[u] = 0;
}
array<int, 2> find(int u) {
    if (u == par[u][0]) return par[u];
    auto res = find(par[u][0]);
    res[1] ^= par[u][1];
    return res;
}
bool is_bipartite;
V<pair<array<int, 2>&, array<int, 2>>> undo_par;
V<pair<bool&, bool>> undo_bipartite;
V<pair<int&, int>> undo_rnk;
void unite(int u, int v) {
    auto U = find(u), V = find(v);
    if (rnk[U[0]] < rnk[V[0]]) swap(U, V);
    undo_bipartite.pb({is_bipartite, is_bipartite});
    undo_par.pb({par[V[0]], par[V[0]]});
    undo_rnk.pb({rnk[U[0]], rnk[U[0]]});

    if (U[0] == V[0]) {
        if (U[1] == V[1]) {
            is_bipartite = false;
        }
    } else {
        int t = U[1]^V[1]^1;
        par[V[0]] = {U[0], t};
        if (rnk[U[0]] == rnk[V[0]]) rnk[U[0]]++;
    }
}
int snapshot() { return undo_par.size(); }
void rollback(int until) {
    while (undo_par.size() > until) {
        undo_par.back().f = undo_par.back().s;
        undo_bipartite.back().f = undo_bipartite.back().s;
        undo_rnk.back().f = undo_rnk.back().s;
        undo_par.pop_back();
        undo_bipartite.pop_back();
        undo_rnk.pop_back();
    }
}
void reset() {
    is_bipartite = true;
    for (int i = 0; i < n; i++) make_set(i);
    undo_par.clear();
    undo_bipartite.clear();
    undo_rnk.clear();
}

void solve() {
    cin >> n >> m >> q;    

    for (int i = 0; i < m; i++) {
        cin >> edges[i][0] >> edges[i][1];
        edges[i][0]--; edges[i][1]--;
    }
    for (int i = 0; i < q; i++) {
        int l, r; cin >> l >> r; l--;
        queries[l/K].pb({l, r, i});
    }
    for (int i = 0; i <= (m-1)/K; i++) sort(all(queries[i]));

    reset();
    for (int b = 0; b <= (m-1)/K; b++) {
        int l = b*K, r = m;
        for (int i = max((b-1)*K, 0); i < l; i++) unite(edges[i][0], edges[i][1]);
        for (auto [L, R, I] : queries[b]) {
            while (r > R) {
                r--;
                unite(edges[r][0], edges[r][1]);
            }
            int photo = snapshot();
            while (l < L) {
                unite(edges[l][0], edges[l][1]);
                l++;
            }
            ans[I] = !is_bipartite;
            rollback(photo);
            l = b*K;
        }
    }

    for (int i = 0; i < q; i++) cout << (ans[i] ? "YES" : "NO") << '\n';
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    solve();
    return 0;
}

Compilation message

Joker.cpp: In function 'void rollback(int)':
Joker.cpp:73:28: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<std::array<int, 2>&, std::array<int, 2> >, std::allocator<std::pair<std::array<int, 2>&, std::array<int, 2> > > >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   73 |     while (undo_par.size() > until) {
      |            ~~~~~~~~~~~~~~~~^~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2392 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2648 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 2396 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2400 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 1 ms 2396 KB Output is correct
28 Correct 2 ms 2396 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2392 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2648 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 2396 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2400 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 1 ms 2396 KB Output is correct
28 Correct 2 ms 2396 KB Output is correct
29 Correct 32 ms 2648 KB Output is correct
30 Correct 54 ms 2564 KB Output is correct
31 Correct 62 ms 2652 KB Output is correct
32 Correct 59 ms 600 KB Output is correct
33 Correct 63 ms 676 KB Output is correct
34 Correct 61 ms 2804 KB Output is correct
35 Correct 60 ms 2652 KB Output is correct
36 Correct 61 ms 2652 KB Output is correct
37 Correct 63 ms 2900 KB Output is correct
38 Correct 59 ms 2728 KB Output is correct
39 Correct 58 ms 2648 KB Output is correct
40 Correct 60 ms 2576 KB Output is correct
41 Correct 61 ms 2652 KB Output is correct
42 Correct 61 ms 2732 KB Output is correct
43 Correct 60 ms 2652 KB Output is correct
44 Correct 61 ms 600 KB Output is correct
45 Correct 62 ms 2652 KB Output is correct
46 Correct 62 ms 2652 KB Output is correct
47 Correct 60 ms 2900 KB Output is correct
48 Correct 61 ms 2652 KB Output is correct
49 Correct 60 ms 2568 KB Output is correct
50 Correct 63 ms 2652 KB Output is correct
51 Correct 62 ms 2648 KB Output is correct
52 Correct 63 ms 2728 KB Output is correct
53 Correct 59 ms 604 KB Output is correct
54 Correct 61 ms 604 KB Output is correct

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Runtime error 66 ms 17256 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2392 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2648 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 2396 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2400 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 1 ms 2396 KB Output is correct
28 Correct 2 ms 2396 KB Output is correct
29 Runtime error 66 ms 17256 KB Execution killed with signal 11
30 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2392 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2648 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 2396 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2400 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 1 ms 2396 KB Output is correct
28 Correct 2 ms 2396 KB Output is correct
29 Correct 32 ms 2648 KB Output is correct
30 Correct 54 ms 2564 KB Output is correct
31 Correct 62 ms 2652 KB Output is correct
32 Correct 59 ms 600 KB Output is correct
33 Correct 63 ms 676 KB Output is correct
34 Correct 61 ms 2804 KB Output is correct
35 Correct 60 ms 2652 KB Output is correct
36 Correct 61 ms 2652 KB Output is correct
37 Correct 63 ms 2900 KB Output is correct
38 Correct 59 ms 2728 KB Output is correct
39 Correct 58 ms 2648 KB Output is correct
40 Correct 60 ms 2576 KB Output is correct
41 Correct 61 ms 2652 KB Output is correct
42 Correct 61 ms 2732 KB Output is correct
43 Correct 60 ms 2652 KB Output is correct
44 Correct 61 ms 600 KB Output is correct
45 Correct 62 ms 2652 KB Output is correct
46 Correct 62 ms 2652 KB Output is correct
47 Correct 60 ms 2900 KB Output is correct
48 Correct 61 ms 2652 KB Output is correct
49 Correct 60 ms 2568 KB Output is correct
50 Correct 63 ms 2652 KB Output is correct
51 Correct 62 ms 2648 KB Output is correct
52 Correct 63 ms 2728 KB Output is correct
53 Correct 59 ms 604 KB Output is correct
54 Correct 61 ms 604 KB Output is correct
55 Incorrect 640 ms 72492 KB Output isn't correct
56 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2392 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2648 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 2396 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2400 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 1 ms 2396 KB Output is correct
28 Correct 2 ms 2396 KB Output is correct
29 Correct 32 ms 2648 KB Output is correct
30 Correct 54 ms 2564 KB Output is correct
31 Correct 62 ms 2652 KB Output is correct
32 Correct 59 ms 600 KB Output is correct
33 Correct 63 ms 676 KB Output is correct
34 Correct 61 ms 2804 KB Output is correct
35 Correct 60 ms 2652 KB Output is correct
36 Correct 61 ms 2652 KB Output is correct
37 Correct 63 ms 2900 KB Output is correct
38 Correct 59 ms 2728 KB Output is correct
39 Correct 58 ms 2648 KB Output is correct
40 Correct 60 ms 2576 KB Output is correct
41 Correct 61 ms 2652 KB Output is correct
42 Correct 61 ms 2732 KB Output is correct
43 Correct 60 ms 2652 KB Output is correct
44 Correct 61 ms 600 KB Output is correct
45 Correct 62 ms 2652 KB Output is correct
46 Correct 62 ms 2652 KB Output is correct
47 Correct 60 ms 2900 KB Output is correct
48 Correct 61 ms 2652 KB Output is correct
49 Correct 60 ms 2568 KB Output is correct
50 Correct 63 ms 2652 KB Output is correct
51 Correct 62 ms 2648 KB Output is correct
52 Correct 63 ms 2728 KB Output is correct
53 Correct 59 ms 604 KB Output is correct
54 Correct 61 ms 604 KB Output is correct
55 Runtime error 66 ms 17256 KB Execution killed with signal 11
56 Halted 0 ms 0 KB -