Submission #447323

#	Time	Username	Problem	Language	Result	Execution time	Memory
447323		tranxuanbach	Birthday gift (IZhO18_treearray)	C++17	30 / 100	4069 ms	5552 KiB

treearray

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

#define endl '\n'
#define fi first
#define se second
#define For(i, l, r) for (int i = l; i < r; i++)
#define ForE(i, l, r) for (int i = l; i <= r; i++)
#define FordE(i, l, r) for (int i = l; i >= r; i--)
#define Fora(v, a) for (auto v: a)
#define bend(a) a.begin(), a.end()
#define isz(a) ((signed)a.size())

using ll = long long;
using ld = long double;
using pii = pair <int, int>;
using vi = vector <int>;
using vpii = vector <pii>;
using vvi = vector <vi>;

const int N = 2e5 + 5, M = __lg(N) + 2;

int n, m, q;
vi adj[N];
int a[N];

int h[N];
int ctrtime, tin[N], tout[N]; pii sptable[M][N];

void dfs_tour(int u, int p){
    tin[u] = tout[u] = ++ctrtime; sptable[0][ctrtime] = {h[u], u};
    Fora(&v, adj[u]){
        if (v == p){
            continue;
        }
        h[v] = h[u] + 1;
        dfs_tour(v, u);
        tout[u] = ++ctrtime; sptable[0][ctrtime] = {h[u], u};
    }
}

int lca(int u, int v){
    int l = min(tin[u], tin[v]), r = max(tout[u], tout[v]), z = __lg(r - l + 1);
    return min(sptable[z][l], sptable[z][r - (1 << z) + 1]).se;
}

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    // freopen(".inp", "r", stdin);
    // freopen(".out", "w", stdout);
    cin >> n >> m >> q;
    For(i, 1, n){
        int u, v; cin >> u >> v;
        adj[u].emplace_back(v);
        adj[v].emplace_back(u);
    }
    ForE(i, 1, m){
        cin >> a[i];
    }
    dfs_tour(1, 1);
    For(j, 1, M){
        ForE(i, 1, ctrtime - (1 << j) + 1){
            sptable[j][i] = min(sptable[j - 1][i], sptable[j - 1][i + (1 << (j - 1))]);
        }
    }
    while (q--){
        int que; cin >> que;
        if (que == 1){
            int pos, u; cin >> pos >> u;
            a[pos] = u;
        }
        else{
            int l, r, u; cin >> l >> r >> u;
            int ansx = -1, ansy = -1;
            ForE(x, l, r){
                int v = a[x];
                if (v == u){
                    ansx = x;
                    ansy = x;
                }
                ForE(y, x + 1, r){
                    v = lca(v, a[y]);
                    if (v == u){
                        ansx = x;
                        ansy = y;
                    }
                }
            }
            cout << ansx << ' ' << ansy << endl;
        }
    }
}

/*
==================================================+
INPUT:                                            |
--------------------------------------------------|
5 4 4
1 2
3 1
3 4
5 3
4 5 2 3
2 1 3 1
1 3 5
2 3 4 5
2 1 3 1

--------------------------------------------------|
==================================================+
OUTPUT:                                           |
--------------------------------------------------|
1 3
3 3
-1 -1
--------------------------------------------------|
==================================================+
*/

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