oj.uz

Submission #665284

# Submission time Handle Problem Language Result Execution time Memory
665284 2022-11-27T10:35:34 Z ParsaS Jail (JOI22_jail) C++17
5 / 100
 133 ms 48552 KB 
// In the name of God
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define mp make_pair
typedef long long ll;
const int N = 2e5 + 5, L = 20;
int n, m, par[N], deg[N];
vector<pair<int, int> > S[N], T[N];
set<int> st[N];
pair<int, int> P[N];
vector<int> G[N], adj[N];
int up[N][L], Tp, tin[N], tout[N];

void dfs(int v, int p) {
    up[v][0] = p;
    for (int l = 1; l < L; l++)
        up[v][l] = up[up[v][l - 1]][l - 1];
    tin[v] = Tp++;
    for (auto u : adj[v]) {
        if (u != p)
            dfs(u, v);
    }
    tout[v] = Tp++;
}
vector<int> tmp;
void _merge(int u, int v) {
    if (st[u].size() > st[v].size())
        st[u].swap(st[v]);
    for (auto x : st[u]) {
        if (st[v].count(x))
            tmp.pb(x);
        st[v].insert(x);
    }
}
void dfs2(int v, int p) {
    int s = -1, t = -1;
    if (!S[v].empty()) {
        s = S[v].back().se;
    }
    if (!T[v].empty())
        t = T[v].back().se;

    tmp.clear();
    for (auto u : adj[v]) {
        if (u == p)
            continue;
        dfs2(u, v);
        _merge(u, v);
    }
    if (s != -1) {
        for (auto u : st[v]) {
            if (u != s)
                G[s].pb(u);
        }
        if (st[v].count(s)) {
            st[v].erase(s);
        }
            
        else
            st[v].insert(s);
    }
    if (t != -1) {
        for (auto u : st[v])
            if (u != t)
                G[u].pb(t);
        if (st[v].count(t))
            st[v].erase(t);
        else
            st[v].insert(t);
    }
    for (auto x : tmp)
        st[v].erase(x);
}
bool anc(int v, int u) {
    return tin[v] <= tin[u] && tout[v] >= tout[u];
}
int lca(int v, int u) {
    if (tin[v] > tin[u])
        swap(v, u);
    if (anc(v, u))
        return v;
    for (int i = L - 1; i >= 0; i--) {
        if (!anc(up[u][i], v))
            u = up[u][i];
    }
    return up[u][0];
}
void solve2() {
    sort(P, P +m);
    for (int i = 0; i < m - 1; i++) {
        if (P[i].se > P[i + 1].se) {
            cout << "No" << '\n';
            return;
        }

    }
    cout << "Yes";
}


void solve() {
    cin >> n;
    for (int i = 1; i <= n; i++)
        S[i].clear(), T[i].clear(), adj[i].clear();
    for (int i = 0; i < m; i++)
        G[i].clear(), deg[i] = 0;
    for (int i = 0; i < n - 1; i++) {
        int v, u; cin >> v >> u;
        adj[v].pb(u), adj[u].pb(v);
    }
    cin >> m;
    vector<pair<pair<int, int>, int> > vec;
    for (int i = 0; i < m; i++) {
        int s, t; cin >> s >> t;
        P[i] = mp(s, t);
        vec.pb(mp(mp(s, t), i));
        S[s].pb(mp(t, i));
        T[t].pb(mp(s, i));
    }
    if (m > 500) {
        solve2();
        return;
    }
        
    for (int i = 0; i < vec.size(); i++) {
        int s = vec[i].fi.fi, t = vec[i].fi.se, v = vec[i].se;
    }
    dfs2(1, 0);
    for (int i = 0; i < m; i++) {
        for (auto u : G[i]) {
            deg[u]++;
        }
    }
    queue<int> Q;
    for (int i = 0; i < m; i++)
        if (deg[i] == 0)
            Q.push(i);
    while (!Q.empty()) {
        int v = Q.front();
        Q.pop();
        for (auto u : G[v]) {
            deg[u]--;
            if (!deg[u])
                Q.push(u);
        }
    }
    cout << (*max_element(deg, deg + m) == 0 ? "Yes" : "No") << '\n';
}

int32_t main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int tc; cin >> tc;
    while (tc--) {
        solve();
    }

    return 0;
}

Compilation message

jail.cpp: In function 'void solve()':
jail.cpp:128:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  128 |     for (int i = 0; i < vec.size(); i++) {
      |                     ~~^~~~~~~~~~~~
jail.cpp:129:13: warning: unused variable 's' [-Wunused-variable]
  129 |         int s = vec[i].fi.fi, t = vec[i].fi.se, v = vec[i].se;
      |             ^
jail.cpp:129:31: warning: unused variable 't' [-Wunused-variable]
  129 |         int s = vec[i].fi.fi, t = vec[i].fi.se, v = vec[i].se;
      |                               ^
jail.cpp:129:49: warning: unused variable 'v' [-Wunused-variable]
  129 |         int s = vec[i].fi.fi, t = vec[i].fi.se, v = vec[i].se;
      |                                                 ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 28440 KB Output is correct
2 Correct 18 ms 28500 KB Output is correct
3 Correct 19 ms 28500 KB Output is correct
4 Correct 27 ms 28820 KB Output is correct
5 Correct 31 ms 29168 KB Output is correct
6 Correct 15 ms 28532 KB Output is correct
7 Correct 17 ms 28592 KB Output is correct
8 Correct 18 ms 28628 KB Output is correct
9 Correct 66 ms 32704 KB Output is correct
10 Correct 59 ms 48552 KB Output is correct
11 Correct 22 ms 28628 KB Output is correct
12 Correct 59 ms 29556 KB Output is correct
13 Correct 85 ms 38280 KB Output is correct
14 Correct 59 ms 38284 KB Output is correct
15 Correct 70 ms 36256 KB Output is correct
16 Correct 133 ms 44860 KB Output is correct
17 Correct 60 ms 39308 KB Output is correct
18 Correct 79 ms 44860 KB Output is correct
19 Correct 61 ms 39292 KB Output is correct
20 Correct 70 ms 39288 KB Output is correct
21 Correct 62 ms 39228 KB Output is correct
22 Correct 64 ms 39332 KB Output is correct

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 28516 KB Output is correct
2 Correct 16 ms 28508 KB Output is correct
3 Correct 17 ms 28500 KB Output is correct
4 Incorrect 16 ms 28500 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 28516 KB Output is correct
2 Correct 16 ms 28508 KB Output is correct
3 Correct 17 ms 28500 KB Output is correct
4 Incorrect 16 ms 28500 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 28516 KB Output is correct
2 Correct 16 ms 28508 KB Output is correct
3 Correct 17 ms 28500 KB Output is correct
4 Incorrect 16 ms 28500 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 28516 KB Output is correct
2 Correct 16 ms 28508 KB Output is correct
3 Correct 17 ms 28500 KB Output is correct
4 Incorrect 16 ms 28500 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 28428 KB Output is correct
2 Correct 13 ms 28500 KB Output is correct
3 Correct 13 ms 28500 KB Output is correct
4 Correct 14 ms 28500 KB Output is correct
5 Correct 21 ms 28540 KB Output is correct
6 Incorrect 15 ms 28500 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 28440 KB Output is correct
2 Correct 18 ms 28500 KB Output is correct
3 Correct 19 ms 28500 KB Output is correct
4 Correct 27 ms 28820 KB Output is correct
5 Correct 31 ms 29168 KB Output is correct
6 Correct 15 ms 28532 KB Output is correct
7 Correct 17 ms 28592 KB Output is correct
8 Correct 18 ms 28628 KB Output is correct
9 Correct 66 ms 32704 KB Output is correct
10 Correct 59 ms 48552 KB Output is correct
11 Correct 22 ms 28628 KB Output is correct
12 Correct 59 ms 29556 KB Output is correct
13 Correct 85 ms 38280 KB Output is correct
14 Correct 59 ms 38284 KB Output is correct
15 Correct 70 ms 36256 KB Output is correct
16 Correct 133 ms 44860 KB Output is correct
17 Correct 60 ms 39308 KB Output is correct
18 Correct 79 ms 44860 KB Output is correct
19 Correct 61 ms 39292 KB Output is correct
20 Correct 70 ms 39288 KB Output is correct
21 Correct 62 ms 39228 KB Output is correct
22 Correct 64 ms 39332 KB Output is correct
23 Correct 15 ms 28516 KB Output is correct
24 Correct 16 ms 28508 KB Output is correct
25 Correct 17 ms 28500 KB Output is correct
26 Incorrect 16 ms 28500 KB Output isn't correct
27 Halted 0 ms 0 KB -