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Submission #950663

# Submission time Handle Problem Language Result Execution time Memory
950663 2024-03-20T14:41:35 Z vladilius Jail (JOI22_jail) C++17
0 / 100
 11 ms 9512 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
const int msz = 2e5 + 5;
const int lg = 22;

struct Seg_Tree{
    vector<int> t, p;
    int n;
    void init(int ns){
        n = ns;
        t.assign(4 * n, 0);
        p.assign(4 * n, 0);
    }
    void push(int& v, int& vv){
        if (!p[v]) return;
        t[vv] += p[v]; t[vv + 1] += p[v];
        p[vv] += p[v]; p[vv + 1] += p[v];
        p[v] = 0;
    }
    void upd(int v, int tl, int tr, int& l, int& r, int& x){
        if (l > tr || r < tl) return;
        if (l <= tl && tr <= r){
            t[v] += x;
            p[v] += x;
            return;
        }
        int tm = (tl + tr) / 2, vv = 2 * v;
        push(v, vv);
        upd(vv, tl, tm, l, r, x);
        upd(vv + 1, tm + 1, tr, l, r, x);
    }
    void upd(int& l, int& r, int x){
        upd(1, 1, n, l, r, x);
    }
    int get(int v, int tl, int tr, int& l, int& r){
        if (l > tr || r < tl) return 0;
        if (l <= tl && tr <= r) return t[v];
        int tm = (tl + tr) / 2, vv = 2 * v;
        push(v, vv);
        return get(vv, tl, tm, l, r) + get(vv + 1, tm + 1, tr, l, r);
    }
    int get(int& l, int& r){
        return get(1, 1, n, l, r);
    }
};

vector<int> g[msz], pw[lg], tin(msz), tout(msz), pp(msz);
int timer = 0;

void fill_dfs(int v, int pr){
    pp[v] = pr;
    tin[v] = ++timer;
    pw[0][v] = pr;
    for (int i = 1; i < lg; i++){
        pw[i][v] = pw[i - 1][pw[i - 1][v]];
    }
    for (int i: g[v]){
        if (i == pr) continue;
        fill_dfs(i, v);
    }
    tout[v] = timer;
}

bool check(int u, int v){
    return (tin[u] <= tin[v] && tout[u] >= tout[v]);
}

int lca(int u, int v){
    if (check(u, v)) return u;
    if (check(v, u)) return v;
    for (int i = lg - 1; i >= 0; i--){
        if (!check(pw[i][u], v)){
            u = pw[i][u];
        }
    }
    return pw[0][u]; // pp[u]
}

vector<int> p(msz);
vector<int> used(msz);

int get(int v){
    if (used[v] || !v) return v;
    if (p[v] == v){
        p[v] = pp[p[v]];
    }
    return p[v] = get(p[v]);
}

vector<bool> vis(msz, false);
vector<int> order, w, h, l;

void dfs(int v){
    used[w[v]] = 0;
    int k;
    while (check(l[v], k = get(pp[w[v]]))){
        if (!k) break;
        dfs(used[k]);
    }
    while (check(l[v], k = get(h[v]))){
        if (!k) break;
        dfs(used[k]);
    }
    order.push_back(v);
}

Seg_Tree T;
vector<bool> s(msz);

int sum(int& u, int& v, int& l){
    return T.get(tin[u], tin[u]) + T.get(tin[v], tin[v]) - 2 * T.get(tin[l], tin[l]) + s[l];
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int q; cin>>q;
    while (q--){
        int n; cin>>n;
        for (int i = 1; i <= n; i++) g[i].clear();
        for (int i = 1; i < n; i++){
            int a, b; cin>>a>>b;
            g[a].push_back(b);
            g[b].push_back(a);
        }
        int m; cin>>m;
        w.resize(m + 1);
        h.resize(m + 1);
        used.assign(n + 1, 0);
        for (int i = 1; i <= m; i++){
            cin>>w[i]>>h[i];
            used[w[i]] = i;
        }
        for (int i = 0; i < lg; i++){
            pw[i].resize(n + 1);
        }
        fill_dfs(1, 1); pp[1] = 0;
        l.resize(m + 1);
        for (int i = 1; i <= m; i++){
            l[i] = lca(w[i], h[i]);
        }
        for (int i = 1; i <= n; i++){
            p[i] = i;
        }
        for (int i = 1; i <= m; i++){
            if (!used[w[i]]) continue;
            dfs(i);
        }
        
        T.init(n);
        s.assign(n + 1, false);
        for (int i = 1; i <= m; i++){
            s[w[i]] = true;
            T.upd(tin[w[i]], tout[w[i]], 1);
        }
        bool ind = true;
        for (int i: order){
            if (sum(w[i], h[i], l[i]) > 1){
                ind = false;
                break;
            }
            T.upd(tin[w[i]], tout[w[i]], -1);
            s[w[i]] = false;
        }
        order.clear();
        cout<<((ind) ? "Yes" : "No")<<"\n";
    }
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9052 KB Output is correct
2 Correct 3 ms 9052 KB Output is correct
3 Correct 3 ms 9052 KB Output is correct
4 Incorrect 11 ms 9512 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9048 KB Output is correct
2 Correct 3 ms 8904 KB Output is correct
3 Incorrect 4 ms 9052 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9048 KB Output is correct
2 Correct 3 ms 8904 KB Output is correct
3 Incorrect 4 ms 9052 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9048 KB Output is correct
2 Correct 3 ms 8904 KB Output is correct
3 Incorrect 4 ms 9052 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9048 KB Output is correct
2 Correct 3 ms 8904 KB Output is correct
3 Incorrect 4 ms 9052 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9048 KB Output is correct
2 Incorrect 3 ms 9052 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9052 KB Output is correct
2 Correct 3 ms 9052 KB Output is correct
3 Correct 3 ms 9052 KB Output is correct
4 Incorrect 11 ms 9512 KB Output isn't correct
5 Halted 0 ms 0 KB -