Submission #961280

#	Time	Username	Problem	Language	Result	Execution time	Memory
961280		Prieved1	Longest Trip (IOI23_longesttrip)	C++17	5 / 100	9 ms	856 KiB

longesttrip

#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;
int cnt=0;
map<int, map<int,int>> mp;
bool query1(int a, int b) {
  if(mp[a][b]!=0)return mp[a][b]-1;
  int c=are_connected({a}, {b});
  mp[a][b]=c+1;
  mp[b][a]=c+1;
  cnt++;
  return c;
}
vector<int> longest_trip(int N, int D)
{
  cnt=0;
  mp.clear();
  srand(time(NULL));
  vector<int> t[2];
  t[0].push_back(0);
  for(int i = 1;i<N;i++) {
    if(t[1].size() > t[0].size())swap(t[0], t[1]);
    if(t[1].size()) {
      if(rand()%2)swap(t[0], t[1]);
    }
    int c=query1(t[0].back(), i);
    if(!c) {
      t[1].push_back(i);
    }
    else {
      t[0].push_back(i);
      if(t[1].size()) {
        c=query1(t[1].back(), i);
        if(c) {
          while(t[1].size()) {
            t[0].push_back(t[1].back());
            t[1].pop_back();
          }
        }
      }
    }
  }
  assert(cnt<=400);
  if(t[0].size()<t[1].size())swap(t[0], t[1]);
  return t[0];
}

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 60