Submission #954481

#	Time	Username	Problem	Language	Result	Execution time	Memory
954481		GrindMachine	Prize (CEOI22_prize)	C++17	54 / 100	3589 ms	412264 KiB

Main

#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;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
https://youtu.be/N69P-6MZor0?list=PLg_Krngrs0eC_1vn0dTjyPZMkwBOcVsgH&t=1328
edi

*/

const int MOD = 1e9 + 7;
const int N = 1e6 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

vector<int> adj[2][N];

template<int t>
struct lca_algo {
    // LCA template (for graphs with 1-based indexing)
 
    int LOG = 1;
    vector<int> depth;
    vector<vector<int>> up;
    vector<int> tin, tout;
    vector<int> order;
    int timer = 1;
 
    lca_algo() {
 
    }
 
    lca_algo(int n, int r) {
        lca_init(n,r);
    }
 
    void lca_init(int n, int r) {
        while ((1 << LOG) < n) LOG++;
        up = vector<vector<int>>(n + 1, vector<int>(LOG, r));
        depth = vector<int>(n + 1);
        tin = vector<int>(n + 1);
        tout = vector<int>(n + 1);
 
        lca_dfs(r, -1);
    }
 
    void lca_dfs(int node, int par) {
        tin[node] = timer++;
        order.pb(node);

        trav(child, adj[t][node]) {
            if (child == par) conts;
 
            up[child][0] = node;
            rep1(j, LOG - 1) {
                up[child][j] = up[up[child][j - 1]][j - 1];
            }
 
            depth[child] = depth[node] + 1;
 
            lca_dfs(child, node);
        }
 
        tout[node] = timer-1;
    }
 
    int lift(int u, int k) {
        rep(j, LOG) {
            if (k & (1 << j)) {
                u = up[u][j];
            }
        }
 
        return u;
    }

    int query(int u, int v) {
        if (depth[u] < depth[v]) swap(u, v);
        int k = depth[u] - depth[v];
        u = lift(u, k);
 
        if (u == v) return u;
 
        rev(j, LOG - 1, 0) {
            if (up[u][j] != up[v][j]) {
                u = up[u][j];
                v = up[v][j];
            }
        }
 
        u = up[u][0];
        return u;
    }
 
    int get_dis(int u, int v) {
        int lca = query(u, v);
        return depth[u] + depth[v] - 2 * depth[lca];
    }
 
    bool is_ances(int u, int v){
        return tin[u] <= tin[v] and tout[u] >= tout[v];
    }
};

void solve(int test_case)
{
    int n,k,q,t; cin >> n >> k >> q >> t;
    vector<int> roots(2);

    rep(t,2){
        rep1(u,n){
            int p; cin >> p;
            if(p == -1){
                roots[t] = u;
            }
            else{
                adj[t][p].pb(u), adj[t][u].pb(p);
            }
        }
    }

    lca_algo<0> lca0(n,roots[0]);
    lca_algo<1> lca1(n,roots[1]);
    auto nodes = lca0.order;
    while(sz(nodes) > k) nodes.pop_back();

    rep(i,k) cout << nodes[i] << " ";
    cout << endl;
    fflush(stdout);
    
    vector<pii> ord;
    trav(u,nodes) ord.pb({lca1.tin[u],u});
    sort(all(ord));

    rep(i,k-1){
        int u = ord[i].ss, v = ord[i+1].ss;
        cout << "? " << u << " " << v << endl;
    }

    cout << "!" << endl;
    fflush(stdout);

    vector<int> depth0(n+5), depth1(n+5);
    pii virtual_root = {inf1,-1};

    rep(i,k-1){
        int u = ord[i].ss, v = ord[i+1].ss;
        int l0 = lca0.query(u,v), l1 = lca1.query(u,v); 
        int d1,d2,d3,d4; cin >> d1 >> d2 >> d3 >> d4;
        depth0[l0] = depth0[u]-d1;
        depth0[v] = depth0[u]-d1+d2;
        depth1[l1] = depth1[u]-d3;
        depth1[v] = depth1[u]-d3+d4;

        pii px = {lca1.depth[l1],l1};
        amin(virtual_root,px);
    }

    // tree 0 => relative to roots[0]
    {
        int d = -depth0[roots[0]];
        rep1(u,n){
            depth0[u] += d;
        }
    }

    // tree 1 => relative to virtual_root.ss
    {
        int d = -depth1[virtual_root.ss];
        rep1(u,n){
            depth1[u] += d;
        }
    }

    vector<pii> queries(t+5);
    rep1(i,t) cin >> queries[i].ff >> queries[i].ss;

    rep1(i,t){
        auto [u,v] = queries[i];
        int l0 = lca0.query(u,v), l1 = lca1.query(u,v);
        int d0 = depth0[u]+depth0[v]-2*depth0[l0];
        int d1 = depth1[u]+depth1[v]-2*depth1[l1];
        cout << d0 << " " << d1 << endl;
    }

    fflush(stdout);
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 25 / 25
• Subtask 3: 19 / 19
• Subtask 4: 0 / 22
• Subtask 5: 0 / 24