Submission #1017888

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1017888	2024-07-09T11:05:00 Z	mindiyak	Highway Tolls (IOI18_highway)	C++14	6 / 100	206 ms	262144 KB

highway

#include "highway.h"
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<int, int> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<ld> vd;
typedef vector<long> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<vector<pi>> vvpi;
#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int MOD = 1000000007;

int N,M;
vi arr;
vi con;
vvpi paths;
ll none = 0,filled = 0;

ll fill_with(int a,int b){
  vi quest(M,0);
  if(a>=0 && b < M){
    FOR(i,a,b+1){
      quest[con[i]]=1;
    }
  }
  ll val = ask(quest);
  // cout << a << " " << b << " | ";
  // for(int i:quest)cout << i << " ";
  // cout << " - " << val << " | ";
  return val;
}

void dfs(int pos,int prev){
  arr.pb(pos);
  for(auto a:paths[pos]){
    if(a.F == prev)continue;
    con.pb(a.S);
    dfs(a.F,pos);
  }
}

void find_pair(int n, std::vector<int> U, std::vector<int> V, int A, int B) {
  N = n;M = N-1;
  paths = vvpi(N,vpi());
  FOR(i,0,M){
    paths[U[i]].pb({V[i],i});
    paths[V[i]].pb({U[i],i});
  }
  int head = -1;
  FOR(i,0,N){
    if(paths[i].size() == 1){
      head = i;
      break;
    }
  }
  dfs(head,-1);

  // for(int i:arr)cout << i << " ";
  // cout << endl;
  // for(int i:con)cout << i << " ";
  // cout << endl;

  none = fill_with(-1,-1);
  // cout << endl;
  filled = fill_with(0,M-1);
  // cout << endl;

  int l=0,r=M-1;
  while(l<r){
    int mid = (l+r)/2;
    ll count = fill_with(0,mid) - none;
    // cout << count << endl;
    if(count > 0){
      r = mid;
    }else{
      l = mid+1;
    }
  }

  int start = arr[l];
  int end = arr[l+(none/A)];

  // cout << start << " " << end << endl;
  answer(start,end);
}

Subtask #1
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	0 ms	344 KB	Output is incorrect: {s, t} is wrong.
2	Halted	0 ms	0 KB	-

Subtask #2
0 / 7.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	344 KB	Output is incorrect: {s, t} is wrong.
2	Halted	0 ms	0 KB	-

Subtask #3
6.0 / 6.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	2044 KB	Output is correct
2	Correct	14 ms	3672 KB	Output is correct
3	Correct	21 ms	5068 KB	Output is correct
4	Correct	63 ms	14980 KB	Output is correct
5	Correct	62 ms	14964 KB	Output is correct
6	Correct	61 ms	14872 KB	Output is correct
7	Correct	63 ms	14980 KB	Output is correct
8	Correct	64 ms	14980 KB	Output is correct
9	Correct	63 ms	14888 KB	Output is correct