Submission #1073795

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073795		shezitt	Highway Tolls (IOI18_highway)	C++14	5 / 100	9 ms	856 KiB

highway

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

using ll = long long;
using namespace std;

#define pb push_back

void find_pair(int N, std::vector<int> U, std::vector<int> V, int A, int B) {
  int M = U.size();
  
  vector<int> tmp(M, 0);
  vector<bool> sirve(M, 1);

  ll W = ask(tmp);

  for(int i=0; i<M; ++i){
    tmp[i] = 1;
    ll w = ask(tmp);
    if(w == W){
      sirve[i] = 0;
    }
    tmp[i] = 0;
  }

  vector<vector<int>> adj(N+1);
  for(int i=0; i<M; ++i) if(sirve[i]){
    adj[U[i]].pb(V[i]);
    adj[V[i]].pb(U[i]);
  }

  auto dfs = [&](auto dfs, int at, int pa=-1) -> int {
    for(int u : adj[at]){ 
      if(u == pa) continue;
      return dfs(dfs, u, at);
    }
    return at;
  };

  int s = dfs(dfs, 0);  
  answer(0, s);

}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 6
• Subtask 4: 0 / 33
• Subtask 5: 0 / 18
• Subtask 6: 0 / 31