Submission #274796

#	Time	Username	Problem	Language	Result	Execution time	Memory
274796		HynDuf	Birthday gift (IZhO18_treearray)	C++14	0 / 100	46 ms	48248 KiB

treearray

#include <bits/stdc++.h>

#define task "T"
#define all(v) (v).begin(), (v).end()
#define rep(i, l, r) for (int i = (l); i <= (r); ++i)
#define Rep(i, r, l) for (int i = (r); i >= (l); --i)
#define DB(X) { cerr << #X << " = " << (X) << '\n'; }
#define DB1(A, _) { cerr << #A << "[" << _ << "] = " << (A[_]) << '\n'; }
#define DB2(A, _, __) { cerr << #A << "[" << _ << "][" << __ << "] = " << (A[_][__]) << '\n'; }
#define DB3(A, _, __, ___) { cerr << #A << "[" << _ << "][" << __ << "][" << ___ << "] = " << (A[_][__][___]) << '\n'; }
#define PR(A, l, r) { cerr << '\n'; rep(_, l, r) DB1(A, _); cerr << '\n';}
#define SZ(x) ((int)(x).size())
#define pb push_back
#define eb emplace_back
#define pf push_front
#define F first
#define S second
#define by(x) [](const auto& a, const auto& b) { return a.x < b.x; } // sort(arr, arr + N, by(a));
#define next ___next
#define prev ___prev
#define y1 ___y1
#define left ___left
#define right ___right
#define y0 ___y0
#define div ___div
#define j0 ___j0
#define jn ___jn

using ll = long long;
using ld = long double;
using ull = unsigned long long;
using namespace std;
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vl;
const int N = 2e5 + 2;
int n, m, q, pa[18][N], dep[N], a[N];
vi g[N];
set<int> pos[N], pos1[N];
void dfs(int u, int p)
{
    dep[u] = dep[p] + 1;
    pa[u][0] = p;
    rep(k, 1, 17) pa[u][k] = pa[pa[u][k - 1]][k - 1];
    for (int v : g[u]) if (v != p) dfs(v, u);
}
int lca(int x, int y)
{
    if (dep[x] < dep[y]) swap(x, y);
    Rep(k, 17, 0) if (dep[pa[x][k]] >= dep[y]) x = pa[x][k];
    if (x == y) return x;
    Rep(k, 17, 0) if (pa[x][k] != pa[y][k]) x = pa[x][k], y = pa[y][k];
    return pa[x][0];
}
int main()
{
#ifdef HynDuf
    freopen(task".in", "r", stdin);
    //freopen(task".out", "w", stdout);
#else
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
#endif
    cin >> n >> m >> q;
    rep(i, 2, n)
    {
        int u, v;
        cin >> u >> v;
        g[u].eb(v);
        g[v].eb(u);
    }
    dfs(1, 0);
    rep(i, 1, m) cin >> a[i];
    rep(i, 1, m) pos[a[i]].insert(i);
    rep(i, 2, m)
    {
        int z = lca(a[i], a[i - 1]);
        pos1[z].insert(i - 1);
    }
    while (q--)
    {
        int t, l, r, v;
        cin >> t >> l >> r;
        if (t == 1)
        {
            pos[a[l]].erase(l);
            if (l > 1) pos1[lca(a[l], a[l - 1])].erase(l - 1);
            if (l < m) pos1[lca(a[l], a[l + 1])].erase(l);
            a[l] = r;
            pos[r].insert(l);
            if (l > 1) pos1[lca(r, a[l - 1])].insert(l - 1);
            if (l < m) pos1[lca(r, a[l + 1])].insert(l);

        } else
        {
            cin >> v;
            if (!pos[v].empty())
            {
                auto it = pos[v].lower_bound(l);
                if (*it <= r)
                {
                    cout << (*it) << ' ' << (*it) << '\n';
                    continue;
                }
            }
            if (!pos1[v].empty())
            {
                auto it = pos1[v].lower_bound(l);
                if (*it < r)
                {
                    cout << (*it) << ' ' << (*it + 1) << '\n';
                    continue;
                }
            }
            cout << "-1 -1\n";
        }
    }
    return 0;
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 18
• Subtask 3: 0 / 26
• Subtask 4: 0 / 44