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Submission #685149

# Submission time Handle Problem Language Result Execution time Memory
685149 2023-01-23T15:26:37 Z stanislavpolyn Joker (BOI20_joker) C++17
14 / 100
 2000 ms 45272 KB 
#include <bits/stdc++.h>

#define fr(i, a, b) for (int i = (a); i <= (b); ++i)
#define rf(i, a, b) for (int i = (a); i >= (b); --i)
#define fe(x, y) for (auto& x : y)

#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define mt make_tuple

#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define pw(x) (1LL << (x))

using namespace std;

mt19937_64 rng(228);

#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <typename T>
using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define fbo find_by_order
#define ook order_of_key

template <typename T>
bool umx(T& a, T b) {
    return a < b ? a = b, 1 : 0;
}
template <typename T>
bool umn(T& a, T b) {
    return a > b ? a = b, 1 : 0;
}

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template <typename T>
using ve = vector<T>;

const int N = 4e5 + 5;

int n, m, q;
ve<pii> e;
int ans[N];

int link[N];
ve<int> g[N];

int root(int x) {
    if (link[x] == x) {
        return x;
    } else {
        return link[x] = root(link[x]);
    }
}

bool uni(int a, int b) {
    a = root(a);
    b = root(b);
    if (a == b) {
        return 0;
    }
    link[a] = b;
    return 1;
}

int dep[N];
int up[N][20];
int tin[N], tout[N], timer;
int vis[N];
ve<pii> ask[N];

void dfs(int v, int p) {
    vis[v] = 1;
    tin[v] = timer++;
    up[v][0] = p;
    fr (i, 1, 19) {
        up[v][i] = up[up[v][i - 1]][i - 1];
    }

    fe (to, g[v]) {
        if (to == p) continue;
        dep[to] = dep[v] + 1;
        dfs(to, v);
    }

    tout[v] = timer;
}

bool isUpper(int a, int b) {
    return tin[a] <= tin[b] && tout[a] >= tout[b];
}

int getLCA(int a, int b) {
    if (isUpper(a, b)) return a;
    if (isUpper(b, a)) return b;

    rf (i, 19, 0) {
        if (up[a][i] && !isUpper(up[a][i], b)) {
            a = up[a][i];
        }
    }
    return up[a][0];
}

int getDist(int a, int b) {
    int c = getLCA(a, b);
    return dep[a] + dep[b] - 2 * dep[c];
}
bool found;

int l, r;

ve<pii> G[N];

void DFS(int v, int p) {
    vis[v] = 1;
    fe (to, G[v]) {
        if (to.fi == p) continue;

        if (to.se >= l && to.se <= r) continue;

        if (!vis[to.fi]) {
            dep[to.fi] = dep[v] + 1;
            DFS(to.fi, v);
        } else {
            if (vis[to.fi] == 2) {
                found |= (dep[v] - dep[to.fi]) % 2 == 0;
            }
        }
    }
    vis[v] = 2;
}

int main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#else
    ios::sync_with_stdio(0);
    cin.tie(0);
#endif

    cin >> n >> m >> q;

    fr (i, 1, m) {
        int a, b;
        cin >> a >> b;
        e.pb({a, b});

        G[a].pb({b, i - 1});
        G[b].pb({a, i - 1});
    }


    fr (i, 0, m - 1) {
        e.pb(e[i]);
    }


    fr (i, 1, q) {
        cin >> l >> r;

        l--;
        r--;
        // r+1..m-1+l

        found = 0;
        fill(vis + 1, vis + 1 + n, 0);
        fr (v, 1, n) {
            if (!vis[v]) {
                dep[v] = 0;
                DFS(v, 0);
            }
        }

        ask[m - 1 + l].pb({r + 1, i});

        if (found) {
            cout << "YES\n";
        } else {
            cout << "NO\n";
        }
    }

    return 0;

    fr (i, 0, sz(e) - 1) {
        if (sz(ask[i])) {
            sort(all(ask[i]));
            reverse(all(ask[i]));

            iota(link, link + n + 1, 0);
            fr (j, 1, n) g[j].clear();

            rf (j, i, 0) {
                if (uni(e[j].fi, e[j].se)) {
                    g[e[j].fi].pb(e[j].se);
                    g[e[j].se].pb(e[j].fi);
                }
            }
            fr (v, 1, n) {
                fr (p, 0, 19) {
                    up[v][p] = 0;
                }
            }

            fill(vis + 1, vis + 1 + n, 0);
            fr (v, 1, n) {
                if (!vis[v]) {
                    timer = 0;
                    dep[v] = 0;
                    dfs(v, 0);
                }
            }

            iota(link, link + n + 1, 0);

            bool ok = 0;
            int ptr = 0;
            rf (j, i, 0) {
                if (uni(e[j].fi, e[j].se)) {

                } else {
                    int d = getDist(e[j].fi, e[j].se);
                    if (d % 2 == 0) {
                        ok = 1;
                    }
                }

                while (ptr < sz(ask[i]) && ask[i][ptr].fi == j) {
                    ans[ask[i][ptr].se] = ok;
                    ptr++;
                }
            }
        }
    }

    fr (i, 1, q) {
        if (ans[i]) {
            cout << "YES\n";
        } else {
            cout << "NO\n";
        }
    }

    return 0;
}

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 28524 KB Output is correct
2 Correct 16 ms 28500 KB Output is correct
3 Correct 16 ms 28500 KB Output is correct
4 Correct 16 ms 28516 KB Output is correct
5 Correct 15 ms 28516 KB Output is correct
6 Correct 14 ms 28500 KB Output is correct
7 Correct 18 ms 28524 KB Output is correct
8 Correct 16 ms 28500 KB Output is correct
9 Correct 14 ms 28500 KB Output is correct
10 Correct 15 ms 28500 KB Output is correct
11 Correct 16 ms 28500 KB Output is correct
12 Correct 15 ms 28500 KB Output is correct
13 Correct 14 ms 28500 KB Output is correct
14 Correct 16 ms 28472 KB Output is correct
15 Correct 14 ms 28500 KB Output is correct
16 Correct 14 ms 28520 KB Output is correct
17 Correct 14 ms 28628 KB Output is correct
18 Correct 16 ms 28500 KB Output is correct
19 Correct 16 ms 28524 KB Output is correct
20 Correct 15 ms 28420 KB Output is correct
21 Correct 15 ms 28468 KB Output is correct
22 Correct 15 ms 28500 KB Output is correct
23 Correct 15 ms 28512 KB Output is correct
24 Correct 16 ms 28504 KB Output is correct
25 Correct 16 ms 28500 KB Output is correct
26 Correct 15 ms 28520 KB Output is correct
27 Correct 17 ms 28444 KB Output is correct
28 Correct 15 ms 28500 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 28524 KB Output is correct
2 Correct 16 ms 28500 KB Output is correct
3 Correct 16 ms 28500 KB Output is correct
4 Correct 16 ms 28516 KB Output is correct
5 Correct 15 ms 28516 KB Output is correct
6 Correct 14 ms 28500 KB Output is correct
7 Correct 18 ms 28524 KB Output is correct
8 Correct 16 ms 28500 KB Output is correct
9 Correct 14 ms 28500 KB Output is correct
10 Correct 15 ms 28500 KB Output is correct
11 Correct 16 ms 28500 KB Output is correct
12 Correct 15 ms 28500 KB Output is correct
13 Correct 14 ms 28500 KB Output is correct
14 Correct 16 ms 28472 KB Output is correct
15 Correct 14 ms 28500 KB Output is correct
16 Correct 14 ms 28520 KB Output is correct
17 Correct 14 ms 28628 KB Output is correct
18 Correct 16 ms 28500 KB Output is correct
19 Correct 16 ms 28524 KB Output is correct
20 Correct 15 ms 28420 KB Output is correct
21 Correct 15 ms 28468 KB Output is correct
22 Correct 15 ms 28500 KB Output is correct
23 Correct 15 ms 28512 KB Output is correct
24 Correct 16 ms 28504 KB Output is correct
25 Correct 16 ms 28500 KB Output is correct
26 Correct 15 ms 28520 KB Output is correct
27 Correct 17 ms 28444 KB Output is correct
28 Correct 15 ms 28500 KB Output is correct
29 Correct 79 ms 28756 KB Output is correct
30 Correct 121 ms 28708 KB Output is correct
31 Correct 121 ms 28708 KB Output is correct
32 Correct 96 ms 28720 KB Output is correct
33 Correct 74 ms 28672 KB Output is correct
34 Correct 125 ms 28864 KB Output is correct
35 Correct 139 ms 28744 KB Output is correct
36 Correct 46 ms 28740 KB Output is correct
37 Correct 90 ms 28664 KB Output is correct
38 Correct 92 ms 28736 KB Output is correct
39 Correct 93 ms 28708 KB Output is correct
40 Correct 86 ms 28732 KB Output is correct
41 Correct 94 ms 28736 KB Output is correct
42 Correct 90 ms 28620 KB Output is correct
43 Correct 85 ms 28708 KB Output is correct
44 Correct 108 ms 28728 KB Output is correct
45 Correct 125 ms 28716 KB Output is correct
46 Correct 128 ms 28736 KB Output is correct
47 Correct 87 ms 28640 KB Output is correct
48 Correct 94 ms 28700 KB Output is correct
49 Correct 114 ms 28720 KB Output is correct
50 Correct 126 ms 28724 KB Output is correct
51 Correct 80 ms 28660 KB Output is correct
52 Correct 97 ms 28724 KB Output is correct
53 Correct 109 ms 28716 KB Output is correct
54 Correct 137 ms 28840 KB Output is correct

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 28524 KB Output is correct
2 Correct 16 ms 28500 KB Output is correct
3 Execution timed out 2068 ms 41480 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 28524 KB Output is correct
2 Correct 16 ms 28500 KB Output is correct
3 Correct 16 ms 28500 KB Output is correct
4 Correct 16 ms 28516 KB Output is correct
5 Correct 15 ms 28516 KB Output is correct
6 Correct 14 ms 28500 KB Output is correct
7 Correct 18 ms 28524 KB Output is correct
8 Correct 16 ms 28500 KB Output is correct
9 Correct 14 ms 28500 KB Output is correct
10 Correct 15 ms 28500 KB Output is correct
11 Correct 16 ms 28500 KB Output is correct
12 Correct 15 ms 28500 KB Output is correct
13 Correct 14 ms 28500 KB Output is correct
14 Correct 16 ms 28472 KB Output is correct
15 Correct 14 ms 28500 KB Output is correct
16 Correct 14 ms 28520 KB Output is correct
17 Correct 14 ms 28628 KB Output is correct
18 Correct 16 ms 28500 KB Output is correct
19 Correct 16 ms 28524 KB Output is correct
20 Correct 15 ms 28420 KB Output is correct
21 Correct 15 ms 28468 KB Output is correct
22 Correct 15 ms 28500 KB Output is correct
23 Correct 15 ms 28512 KB Output is correct
24 Correct 16 ms 28504 KB Output is correct
25 Correct 16 ms 28500 KB Output is correct
26 Correct 15 ms 28520 KB Output is correct
27 Correct 17 ms 28444 KB Output is correct
28 Correct 15 ms 28500 KB Output is correct
29 Execution timed out 2068 ms 41480 KB Time limit exceeded
30 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 28524 KB Output is correct
2 Correct 16 ms 28500 KB Output is correct
3 Correct 16 ms 28500 KB Output is correct
4 Correct 16 ms 28516 KB Output is correct
5 Correct 15 ms 28516 KB Output is correct
6 Correct 14 ms 28500 KB Output is correct
7 Correct 18 ms 28524 KB Output is correct
8 Correct 16 ms 28500 KB Output is correct
9 Correct 14 ms 28500 KB Output is correct
10 Correct 15 ms 28500 KB Output is correct
11 Correct 16 ms 28500 KB Output is correct
12 Correct 15 ms 28500 KB Output is correct
13 Correct 14 ms 28500 KB Output is correct
14 Correct 16 ms 28472 KB Output is correct
15 Correct 14 ms 28500 KB Output is correct
16 Correct 14 ms 28520 KB Output is correct
17 Correct 14 ms 28628 KB Output is correct
18 Correct 16 ms 28500 KB Output is correct
19 Correct 16 ms 28524 KB Output is correct
20 Correct 15 ms 28420 KB Output is correct
21 Correct 15 ms 28468 KB Output is correct
22 Correct 15 ms 28500 KB Output is correct
23 Correct 15 ms 28512 KB Output is correct
24 Correct 16 ms 28504 KB Output is correct
25 Correct 16 ms 28500 KB Output is correct
26 Correct 15 ms 28520 KB Output is correct
27 Correct 17 ms 28444 KB Output is correct
28 Correct 15 ms 28500 KB Output is correct
29 Correct 79 ms 28756 KB Output is correct
30 Correct 121 ms 28708 KB Output is correct
31 Correct 121 ms 28708 KB Output is correct
32 Correct 96 ms 28720 KB Output is correct
33 Correct 74 ms 28672 KB Output is correct
34 Correct 125 ms 28864 KB Output is correct
35 Correct 139 ms 28744 KB Output is correct
36 Correct 46 ms 28740 KB Output is correct
37 Correct 90 ms 28664 KB Output is correct
38 Correct 92 ms 28736 KB Output is correct
39 Correct 93 ms 28708 KB Output is correct
40 Correct 86 ms 28732 KB Output is correct
41 Correct 94 ms 28736 KB Output is correct
42 Correct 90 ms 28620 KB Output is correct
43 Correct 85 ms 28708 KB Output is correct
44 Correct 108 ms 28728 KB Output is correct
45 Correct 125 ms 28716 KB Output is correct
46 Correct 128 ms 28736 KB Output is correct
47 Correct 87 ms 28640 KB Output is correct
48 Correct 94 ms 28700 KB Output is correct
49 Correct 114 ms 28720 KB Output is correct
50 Correct 126 ms 28724 KB Output is correct
51 Correct 80 ms 28660 KB Output is correct
52 Correct 97 ms 28724 KB Output is correct
53 Correct 109 ms 28716 KB Output is correct
54 Correct 137 ms 28840 KB Output is correct
55 Execution timed out 2071 ms 45272 KB Time limit exceeded
56 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 28524 KB Output is correct
2 Correct 16 ms 28500 KB Output is correct
3 Correct 16 ms 28500 KB Output is correct
4 Correct 16 ms 28516 KB Output is correct
5 Correct 15 ms 28516 KB Output is correct
6 Correct 14 ms 28500 KB Output is correct
7 Correct 18 ms 28524 KB Output is correct
8 Correct 16 ms 28500 KB Output is correct
9 Correct 14 ms 28500 KB Output is correct
10 Correct 15 ms 28500 KB Output is correct
11 Correct 16 ms 28500 KB Output is correct
12 Correct 15 ms 28500 KB Output is correct
13 Correct 14 ms 28500 KB Output is correct
14 Correct 16 ms 28472 KB Output is correct
15 Correct 14 ms 28500 KB Output is correct
16 Correct 14 ms 28520 KB Output is correct
17 Correct 14 ms 28628 KB Output is correct
18 Correct 16 ms 28500 KB Output is correct
19 Correct 16 ms 28524 KB Output is correct
20 Correct 15 ms 28420 KB Output is correct
21 Correct 15 ms 28468 KB Output is correct
22 Correct 15 ms 28500 KB Output is correct
23 Correct 15 ms 28512 KB Output is correct
24 Correct 16 ms 28504 KB Output is correct
25 Correct 16 ms 28500 KB Output is correct
26 Correct 15 ms 28520 KB Output is correct
27 Correct 17 ms 28444 KB Output is correct
28 Correct 15 ms 28500 KB Output is correct
29 Correct 79 ms 28756 KB Output is correct
30 Correct 121 ms 28708 KB Output is correct
31 Correct 121 ms 28708 KB Output is correct
32 Correct 96 ms 28720 KB Output is correct
33 Correct 74 ms 28672 KB Output is correct
34 Correct 125 ms 28864 KB Output is correct
35 Correct 139 ms 28744 KB Output is correct
36 Correct 46 ms 28740 KB Output is correct
37 Correct 90 ms 28664 KB Output is correct
38 Correct 92 ms 28736 KB Output is correct
39 Correct 93 ms 28708 KB Output is correct
40 Correct 86 ms 28732 KB Output is correct
41 Correct 94 ms 28736 KB Output is correct
42 Correct 90 ms 28620 KB Output is correct
43 Correct 85 ms 28708 KB Output is correct
44 Correct 108 ms 28728 KB Output is correct
45 Correct 125 ms 28716 KB Output is correct
46 Correct 128 ms 28736 KB Output is correct
47 Correct 87 ms 28640 KB Output is correct
48 Correct 94 ms 28700 KB Output is correct
49 Correct 114 ms 28720 KB Output is correct
50 Correct 126 ms 28724 KB Output is correct
51 Correct 80 ms 28660 KB Output is correct
52 Correct 97 ms 28724 KB Output is correct
53 Correct 109 ms 28716 KB Output is correct
54 Correct 137 ms 28840 KB Output is correct
55 Execution timed out 2068 ms 41480 KB Time limit exceeded
56 Halted 0 ms 0 KB -