제출 #1088589

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1088589		vladilius	Birthday gift (IZhO18_treearray)	C++17	56 / 100	4074 ms	41752 KiB

treearray

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, m, q; cin>>n>>m>>q;
    vector<int> g[n + 1];
    for (int i = 1; i < n; i++){
        int u, v; cin>>u>>v;
        g[u].pb(v);
        g[v].pb(u);
    }
    
    const int lg = log2(n);
    vector<vector<int>> pw(n + 1, vector<int>(lg + 1));
    vector<int> tin(n + 1), tout(n + 1);
    int timer = 0;
    function<void(int, int)> fill = [&](int v, int pr){
        tin[v] = ++timer;
        pw[v][0] = pr;
        for (int i = 1; i <= lg; i++){
            pw[v][i] = pw[pw[v][i - 1]][i - 1];
        }
        for (int i: g[v]){
            if (i == pr) continue;
            fill(i, v);
        }
        tout[v] = timer;
    };
    fill(1, 1);
    
    auto check = [&](int x, int y){
        return (tin[x] <= tin[y] && tout[x] >= tout[y]);
    };
    
    auto lca = [&](int x, int y){
        if (check(x, y)) return x;
        if (check(y, x)) return y;
        for (int i = lg; i >= 0; i--){
            if (!check(pw[x][i], y)){
                x = pw[x][i];
            }
        }
        return pw[x][0];
    };
    
    vector<int> a(m + 1);
    for (int i = 1; i <= m; i++){
        cin>>a[i];
    }
    while (q--){
        int type; cin>>type;
        if (type == 1){
            int p, v; cin>>p>>v;
            a[p] = v;
        }
        else {
            int l, r, v; cin>>l>>r>>v;
            int l1 = -1, r1 = -1;
            for (int i = l; i <= r; i++){
                if (a[i] == v){
                    l1 = r1 = i;
                    break;
                }
            }
            if (l1 != -1){
                cout<<l1<<" "<<r1<<"\n";
                continue;
            }
            for (int i = l; i + 1 <= r; i++){
                if (lca(a[i], a[i + 1]) == v){
                    l1 = i; r1 = i + 1;
                    break;
                }
            }
            cout<<l1<<" "<<r1<<"\n";
        }
    }
}

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