Submission #666673

#	Time	Username	Problem	Language	Result	Execution time	Memory
666673		divad	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	55 ms	356 KiB

eastereggs

#include <cstring>
#include <vector>
#include <deque>
#include "grader.h"
#define MAX 522
using namespace std;
int vf[MAX];
vector<int> v[MAX];
int n,x,y;

vector<int> bfs(int N, vector< pair<int, int> > bridges){
    memset(vf, 0, sizeof(vf));
    for(int i = 0; i < MAX; i++){
        v[i].clear();
    }
    for(auto [x, y]: bridges){
        v[x].push_back(y);
        v[y].push_back(x);
    }
    deque<int> coada;
    vf[1] = 1;
    int maxi = 0;
    coada.push_back(1);
    while(!coada.empty()){
        int nod = coada.back();
        for(auto vecin: v[nod]){
            if(vf[vecin] == 0){
                vf[vecin] = 1+vf[nod];
                maxi = max(maxi, vf[vecin]);
                coada.push_front(vecin);
            }
        }
        coada.pop_back();
    }
    vector<int> ans;
    for(int i = 1; i <= maxi; i++){
        for(int j = 0; j <= N; j++){
            if(vf[j] == i){
                ans.push_back(j);
            }
        }
    }
    return ans;
}

int findEgg(int N, vector< pair<int, int> > bridges){
    vector<int> parcurgere = bfs(N, bridges);
    /// 0 0 0 0 1 1 1 1
    ///         ^
    int st = 0, dr = parcurgere.size()-2;
    int ans = parcurgere.back();
    while(st <= dr){
        int mid = (st+dr)/2;
        vector<int> partit;
        for(int i = 0; i <= mid; i++){
            partit.push_back(parcurgere[i]);
        }
        if(query(partit)){
            ans = parcurgere[mid];
            dr = mid-1;
        }else{
            st = mid+1;
        }
    }
    return ans;
}

• Subtask 1: 40 / 40
• Subtask 2: 40 / 40
• Subtask 3: 20 / 20