Submission #635774

#	Time	Username	Problem	Language	Result	Execution time	Memory
635774		Dec0Dedd	Easter Eggs (info1cup17_eastereggs)	C++11	100 / 100	20 ms	336 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"

using namespace std;

#define pii pair<int, int>

const int N = 513;

vector<int> G[N], pre;
int n;

void dfs(int v, int p) {
   pre.push_back(v);
   for (auto u : G[v]) {
      if (u == p) continue;
      dfs(u, v); 
   }
}

vector<int> genIsl(int m) {
   vector<int> res;
   for (int i=0; i<=m; ++i) res.push_back(pre[i]);
   return res;
}

int findEgg(int sz, vector<pii> x) {
   n=sz;
   for (auto u : x) {
      int a=u.first, b=u.second;
      G[a].push_back(b);
      G[b].push_back(a);
   }
   dfs(1, 1);

   int l=0, r=n-1;
   while (l < r) {
      int m=(l+r)/2;
      if (query(genIsl(m))) r=m;
      else l=m+1;
   }

   for (int i=0; i<=n; ++i) G[i].clear();
   pre.clear();
   return pre[l];
}

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