Submission #1055419

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055419		Boas	Jail (JOI22_jail)	C++17	0 / 100	18 ms	828 KiB

jail

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;

template <typename T1, typename T2>
using indexed_map = tree<T1, T2, less<T1>, rb_tree_tag, tree_order_statistics_node_update>;
template <typename T>
using indexed_set = indexed_map<T, null_type>;

#define loop(x, i) for (int i = 0; i < (x); i++)
#define loop1(x, i) for (int i = 1; i <= (x); i++)
#define rev(x, i) for (int i = (int)(x) - 1; i >= 0; i--)
#define itloop(x) for (auto it = begin(x); x != end(x); it++)
#define itrev(x) for (auto it = rbegin(x); x != rend(x); it++)
#define int long long
#define INF ((int64_t)(4e18 + 1))
#define INF32 ((int32_t)(2e9 + 1))
#define ALL(x) begin(x), end(x)
#define RALL(x) rbegin(x), rend(x)
#define existsIn(x, l) (count(ALL(l), x) > 0)
#define removeIn(x, l) l.erase(find(ALL(l), x))
#define pb push_back
#define sz(x) (int)(x).size()
#define F first
#define S second
#define var const auto &
#define foreach(l) for (var e : l)

typedef pair<int, int> ii;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<vii> vvii;
typedef vector<viii> vviii;
typedef set<int> si;
typedef set<ii> sii;
typedef set<iii> siii;
typedef vector<si> vsi;
typedef vector<sii> vsii;
typedef vector<vsi> vvsi;
typedef vector<string> vstr;
typedef vector<vector<string>> vvstr;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vi::iterator viit;
typedef si::iterator siit;
typedef int8_t in8;
typedef int16_t in16;
typedef int32_t in32;
typedef int64_t in64;

typedef bitset<500> bs;
typedef vector<bs> vbs;
typedef vector<vbs> vvbs;

void solve()
{
    int n, m;
    cin >> n;
    vvi adj(n);
    loop(n - 1, i)
    {
        int a, b;
        cin >> a >> b;
        a--;
        b--;
        adj[a].pb(b);
        adj[b].pb(a);
    }
    cin >> m;
    // vi mIx(n);
    vvbs bedRooms(20, vbs(n));
    vvi p(20, vi(n));
    vi s(m), t(m), d(n);
    loop(m, i)
    {
        cin >> s[i] >> t[i];
        s[i]--;
        t[i]--;
        // mIx[s[i]] = i;
        bedRooms[0][s[i]][i] = 1;
    }
    auto dfs = [&](auto &&self, int i, int prev) -> void
    {
        for (int j : adj[i])
        {
            if (j == prev)
                continue;
            d[j] = d[i] + 1;
            p[0][j] = i;
            self(self, j, i);
        }
    };
    dfs(dfs, 0, 0);
    loop1(19, x)
    {
        loop(n, i)
        {
            int half = p[x - 1][i];
            p[x][i] = p[x - 1][half];
            bedRooms[x][i] = bedRooms[x - 1][i] | bedRooms[x - 1][half];
        }
    }
    typedef pair<int, bs> ibs;
    auto getParent = [&](int i, int k) -> ibs
    {
        bs bedrms;
        loop(20, x)
        {
            if ((1 << x) & k)
            {
                bedrms |= bedRooms[x][i];
                i = p[x][i];
            }
        }
        // bedrms |= bedRooms[0][i];
        return {i, bedrms};
    };
    auto LCA = [&](int A, int b) -> ibs
    {
        if (d[A] - d[b] < 0)
            swap(A, b);
        auto [a, bedrms] = getParent(A, d[A] - d[b]);
        if (a == b)
        {
            bedrms |= bedRooms[0][a];
            return {a, bedrms};
        }
        rev(20, x)
        {
            if (p[x][a] != p[x][b])
            {
                bedrms |= bedRooms[x][a];
                bedrms |= bedRooms[x][b];
                a = p[x][a];
                b = p[x][b];
            }
        }
        bedrms |= bedRooms[1][a]; // voor de laatste erbij
        bedrms |= bedRooms[0][b];
        return {p[0][a], bedrms};
    };
    int done = 0;
    vvi inPad(m);
    vi ervoor(m);
    loop(m, i)
    {
        auto [lca, bedrms] = LCA(s[i], t[i]);
        for (int j = bedrms._Find_first(); j < 500; j = bedrms._Find_next(j))
        {
            if (j == i)
                continue;
            ervoor[i]++;
            inPad[j].pb(i);
        }
    }
    stack<int> q;
    loop(m, i)
    {
        if (ervoor[i] == 0)
            q.push(i);
    }
    while (!q.empty())
    {
        int i = q.top();
        q.pop();
        done++;
        for (int j : inPad[i])
        {
            ervoor[j]--;
            if (ervoor[j] == 0)
            {
                q.push(j);
            }
        }
    }
    if (done == m)
        cout << "Yes" << endl;
    else
        cout << "No" << endl;
}

signed main()
{
    cin.tie(0)->sync_with_stdio(0);
    int t = 1;
    cin >> t;
    while (t--)
    {
        solve();
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23