Submission #7478421


Source Code Expand

#include <bits/stdc++.h>
using namespace std;

# define REP(i,n) for (int i=0;i<(n);++i)
# define PER(i,n) for (int i=(N-1);i>=0;--i)
# define rep(i,a,b) for(int i=a;i<(b);++i)
# define p(s) std::cout << s ;
# define pl(s)  std::cout << s << endl;
# define printIf(j,s1,s2) cout << (j ? s1 : s2) << endl;
# define YES(j) cout << (j ? "YES" : "NO") << endl;
# define Yes(j) std::cout << (j ? "Yes" : "No") << endl;
# define yes(j) std::cout << (j ? "yes" : "no") << endl;
# define all(v) v.begin(),v.end()
# define showVector(v) REP(i,v.size()){p(v[i]);p(" ")} pl("")
template<class T> inline bool chmin(T &a, T b){ if(a > b) { a = b; return true;} return false;}
template<class T> inline bool chmax(T &a, T b){ if(a < b) { a = b; return true;} return false;}
typedef long long int ll;
typedef pair<ll,ll> P_ii;
typedef pair<double,double> P_dd;

template<class T>
vector<T> make_vec(size_t a){
    return vector<T>(a);
}

template<class T, class... Ts>
auto make_vec(size_t a, Ts... ts){
  return vector<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));
}

template<typename T,typename V>
typename enable_if<is_class<T>::value==0>::type
fill_v(T &t,const V &v){t=v;}

template<typename T,typename V>
typename enable_if<is_class<T>::value!=0>::type
fill_v(T &t,const V &v){
  for(auto &e:t) fill_v(e,v);
}


const int MOD = 1000000007;
const int inf=1e9+7;
const ll longinf=1LL<<60 ;


int main(){
  int N;
  cin >> N;

  ll d = 0;
  int j = 0;
  for(int i = 2; i <= N; i++){
    printf("? %d %d\n", 1, i);

    ll dist;
    cin >> dist;

    if(d < dist){
      d = dist;
      j = i;
    }

  }

  ll ans = 0;
  for(int i = 1; i <= N ; i++) {
    if(i == j) continue;

    printf("? %d %d\n", j, i);
  
    ll dist;
    cin >> dist;

    chmax(ans, dist);
  }

  cout << "! " << ans << endl;

  return 0;
}

Submission Info

Submission Time
Task D - 高橋くんと木の直径
User azz
Language C++14 (GCC 5.4.1)
Score 100
Code Size 1893 Byte
Status AC
Exec Time 7 ms
Memory 724 KB

Judge Result

Set Name Sample Subtask1 All
Score / Max Score 0 / 0 20 / 20 80 / 80
Status
AC × 1
AC × 22
AC × 42
Set Name Test Cases
Sample subtask0_0.txt
Subtask1 subtask1_0.txt, subtask1_1.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt, subtask1_13.txt, subtask1_14.txt, subtask1_15.txt, subtask1_16.txt, subtask1_17.txt, subtask1_18.txt, subtask1_19.txt, subtask1_2.txt, subtask1_20.txt, subtask1_3.txt, subtask1_4.txt, subtask1_5.txt, subtask1_6.txt, subtask1_7.txt, subtask1_8.txt, subtask1_9.txt, subtask0_0.txt
All subtask0_0.txt, subtask1_0.txt, subtask1_1.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt, subtask1_13.txt, subtask1_14.txt, subtask1_15.txt, subtask1_16.txt, subtask1_17.txt, subtask1_18.txt, subtask1_19.txt, subtask1_2.txt, subtask1_20.txt, subtask1_3.txt, subtask1_4.txt, subtask1_5.txt, subtask1_6.txt, subtask1_7.txt, subtask1_8.txt, subtask1_9.txt, subtask2_0.txt, subtask2_1.txt, subtask2_10.txt, subtask2_11.txt, subtask2_12.txt, subtask2_13.txt, subtask2_14.txt, subtask2_15.txt, subtask2_16.txt, subtask2_17.txt, subtask2_18.txt, subtask2_19.txt, subtask2_2.txt, subtask2_3.txt, subtask2_4.txt, subtask2_5.txt, subtask2_6.txt, subtask2_7.txt, subtask2_8.txt, subtask2_9.txt
Case Name Status Exec Time Memory
subtask0_0.txt AC 4 ms 720 KB
subtask1_0.txt AC 7 ms 720 KB
subtask1_1.txt AC 7 ms 720 KB
subtask1_10.txt AC 7 ms 716 KB
subtask1_11.txt AC 7 ms 724 KB
subtask1_12.txt AC 7 ms 720 KB
subtask1_13.txt AC 7 ms 720 KB
subtask1_14.txt AC 7 ms 720 KB
subtask1_15.txt AC 7 ms 724 KB
subtask1_16.txt AC 7 ms 720 KB
subtask1_17.txt AC 7 ms 720 KB
subtask1_18.txt AC 7 ms 720 KB
subtask1_19.txt AC 7 ms 724 KB
subtask1_2.txt AC 7 ms 724 KB
subtask1_20.txt AC 3 ms 720 KB
subtask1_3.txt AC 7 ms 720 KB
subtask1_4.txt AC 7 ms 720 KB
subtask1_5.txt AC 7 ms 720 KB
subtask1_6.txt AC 7 ms 724 KB
subtask1_7.txt AC 7 ms 724 KB
subtask1_8.txt AC 7 ms 720 KB
subtask1_9.txt AC 7 ms 720 KB
subtask2_0.txt AC 7 ms 720 KB
subtask2_1.txt AC 7 ms 724 KB
subtask2_10.txt AC 7 ms 720 KB
subtask2_11.txt AC 7 ms 720 KB
subtask2_12.txt AC 7 ms 724 KB
subtask2_13.txt AC 7 ms 716 KB
subtask2_14.txt AC 7 ms 720 KB
subtask2_15.txt AC 7 ms 720 KB
subtask2_16.txt AC 7 ms 720 KB
subtask2_17.txt AC 7 ms 720 KB
subtask2_18.txt AC 7 ms 720 KB
subtask2_19.txt AC 6 ms 716 KB
subtask2_2.txt AC 7 ms 720 KB
subtask2_3.txt AC 6 ms 720 KB
subtask2_4.txt AC 7 ms 720 KB
subtask2_5.txt AC 7 ms 724 KB
subtask2_6.txt AC 7 ms 716 KB
subtask2_7.txt AC 7 ms 716 KB
subtask2_8.txt AC 7 ms 716 KB
subtask2_9.txt AC 7 ms 720 KB