Submission #1163973

#	Time	Username	Problem	Language	Result	Execution time	Memory
1163973		omar1312	Birthday gift (IZhO18_treearray)	C++20	0 / 100	2 ms	4928 KiB

treearray

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_multiset;
#define ll long long
#define pb push_back
#define all(x) x.begin(), x.end()
const int mod = 1000000007;
const int N = 200005;
ll a[N+2], dp[N+2], sp[N+2][32], dep[N+2], par[N+2];
vector<int> adj[N+2];
void dfs(int n, int _par, int d){
    dep[n] = d;
    par[n] = _par;
    for(auto i : adj[n]){
        if(i == _par)continue;
        dfs(i, n, d + 1);
    }
}
void solve(){
    int n, m, q;
    cin>>n>>m>>q;
    for(int i = 0; i < n - 1; i++){
        int u, v;
        cin>>u>>v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    for(int i = 0; i < m; i++){
        cin>>a[i];
    }
    dfs(1, 0, 0);
    // cerr<<__LINE__;
    // return;
    for(int i = 1; i <= n; i++){
        sp[i][0] = par[i];
    }
    for(int j = 1; j < 30; j++){
        for(int i = 1; i <= n; i++){
            sp[i][j] = sp[sp[i][j - 1]][j - 1];
        }
    }
    auto lca = [&](int u, int v) -> ll{
        if(dep[u] < dep[v])swap(u, v);
        if(dep[u] != dep[v]){
            ll delta = dep[u] - dep[v];
            for(int j = 0; j < 30; j++){
                if((delta >> j) & 1){
                    u = sp[u][j];
                }
            }
        }
        if(u == v)return u;
        for(int j = 0; j < 30; j++){
            if(sp[u][j] != sp[v][j]){
                u = sp[u][j];
                v = sp[v][j];
            }
        }
        return par[u];
    };
    while(q--){
        int t;
        cin>>t;
        if(t == 1){
            int u, v;
            cin>>u>>v;
            a[--u] = v;
        }
        else{
            int l, r, v;
            cin>>l>>r>>v;
            for(int i = 1; i <= m; i++){
                for(int l = 0, r = i; r < m; l++, r++){
                    ll cur = -1;
                    for(int k = l; k <= r; k++){
                        if(~cur)cur = lca(cur, a[k]);
                        else cur = a[k];
                    }
                    if(cur == v){
                        cout<<l<<' '<<r<<"\n"[!q];
                        goto done;
                    }
                }
            }
            cout<<"-1 -1\n";
            done:;
        }
    }
}
int main(){
cin.tie(0)->sync_with_stdio(0);
    int tt = 1;
    //cin>>tt;
    while(tt--){
        solve();
        // cout<<'\n';
    }
}

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