oj.uz

Submission #835591

# Submission time Handle Problem Language Result Execution time Memory
835591 2023-08-23T16:23:06 Z VMaksimoski008 Easter Eggs (info1cup17_eastereggs) C++14
0 / 100
 1 ms 464 KB 
#include <bits/stdc++.h>
#include "grader.h"

#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
//#define int long long

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
const double eps = 1e-9;

void setIO() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

vector<vector<int> > graph;
vector<int> euler;
int timer = 0;

void dfs(int u, int p) {
    euler[timer++] = u;

    for(int &v : graph[u]) {
        if(v == p) continue;
        dfs(v, u);
    }
}

// int ANS = 3;

// bool query(vector<int> v) {
//     cout << "QUERY: ";
//     for(int &x : v) cout << x << " ";
//     cout << '\n';
//     bool ans = false;
//     for(int &x : v) if(x == ANS) ans = true;
//     cout << "ANSWER: " << ans << '\n';
//     return ans;
// }

int findEgg(int n, vector<pair<int, int> > edges) {
    graph.clear();
    euler.clear();
    graph.resize(n+1);
    euler.resize(n);
    for(pair<int, int> &edge : edges) {
        graph[edge.first].push_back(edge.second);
        graph[edge.second].push_back(edge.first);
    }

    dfs(1, 0);
    int ans = 0;

    int l=0, r=n-1;
    while(l <= r) {
        if(l == r) return euler[l];
        int mid = (l + r) / 2;
        vector<int> to_query(euler.begin(), euler.begin() + mid + 1);
        //cout << l+1 << " " << r+1 << " " << mid+1 << '\n';
        if(query(to_query)) {
            ans = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }

    return euler[ans];
}

// int32_t main() {
//     setIO();

//     int n;
//     cin >> n;

//     vector<pii> edges(n-1);
//     for(int i=0; i<n-1; i++) {
//         int a, b;
//         cin >> a >> b;
//         edges[i] = {a, b};
//     }

//     cout << findEgg(n, edges) << '\n';
//     return 0;
// }

Subtask #1
0 / 40.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 464 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #2
0 / 40.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 464 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 464 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -