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Submission #918577

# Submission time Handle Problem Language Result Execution time Memory
918577 2024-01-30T07:00:37 Z vjudge1 Easter Eggs (info1cup17_eastereggs) C++17
100 / 100
 13 ms 1248 KB 
#include <bits/stdc++.h>
#include "grader.h"
using namespace std;
vector<vector<int>> ve;
vector<int> w;
void dfs(int x, int p){
    w.push_back(x);
    for (auto el : ve[x]){
        if (el != p){
            dfs(el, x);
        }
    }
}
int findEgg (int N, vector < pair < int, int > > bridges)
{
    w.clear();
    ve.clear();
    ve.resize(N + 1);
    for (auto el : bridges){
        ve[el.first].push_back(el.second);
        ve[el.second].push_back(el.first);
    }
    dfs(1, -1);
    int l = 1, r = N;
    while (l <= r){
        if (l == r){
            return w[l - 1];
        }
        int mid = (l + r) / 2;
        vector<int> rec;
        for (int i = 0; i < mid; i++){
            rec.push_back(w[i]);
        }
        bool a = query(rec);
        if (a){
            r = mid;
        }
        else{
            l = mid + 1;
        }
    }
    return w[l - 1];
}

Subtask #1
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Number of queries: 4
2 Correct 1 ms 344 KB Number of queries: 4
3 Correct 1 ms 344 KB Number of queries: 4
4 Correct 1 ms 344 KB Number of queries: 4

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 732 KB Number of queries: 8
2 Correct 8 ms 472 KB Number of queries: 9
3 Correct 13 ms 1248 KB Number of queries: 9
4 Correct 11 ms 988 KB Number of queries: 9

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 496 KB Number of queries: 9
2 Correct 11 ms 728 KB Number of queries: 9
3 Correct 11 ms 1244 KB Number of queries: 9
4 Correct 12 ms 996 KB Number of queries: 9