Submission #1206560

#	Time	Username	Problem	Language	Result	Execution time	Memory
1206560		hyakup	Closing Time (IOI23_closing)	C++20	8 / 100	77 ms	31924 KiB

closing

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

const int maxn = 2e5;

using ll = long long;

const ll inf = 1e18;

vector<vector<pair<int, int>>> adj;
vector<vector<ll>> dist;

void init( int n ){
  adj.clear(); adj.resize(n);
  dist.clear(); dist.resize( 2, vector<ll>(n));
}

void dfs( int cur, int pai, int t ){
  for( auto [viz, d] : adj[cur] ) if( viz != pai ){
    dist[t][viz] = dist[t][cur] + d;
    dfs( viz, cur, t );
  }
}

int max_score(int n, int x, int y, long long k, vector<int> a, vector<int> b, vector<int> c ) {
  init(n);
  int m = a.size();
  for( int i = 0; i < m; i++ ){
    adj[a[i]].push_back({ b[i], c[i] });
    adj[b[i]].push_back({ a[i], c[i] });
  }

  dfs( x, x, 0 );
  dfs( y, y, 1 );

  tuple<ll, ll, ll> opt( inf, inf, inf );
  for( int i = 0; i < n; i++ ) opt = min( opt, make_tuple( abs(dist[0][i] - dist[1][i]), dist[0][i] + dist[1][i], (ll)i ) );

  int z = get<2>(opt);

  vector<int> marc(n);

  set<pair<ll, int>> s;
  s.insert({ 0, x });
  s.insert({ 0, y });

  marc[x] = marc[y] = true;

  int resp = 0;

  while( !s.empty() ){
    auto [cost, cur] = *s.begin(); s.erase(s.begin());
    if( cost > k ) break;
    k -= cost;
    resp++;
    marc[cur] = true;
    for( auto [viz, d] : adj[cur] ) if( !marc[viz] ) s.insert({ cost + d, viz });
  }

  return resp;
}

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 9
• Subtask 6: 0 / 11
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 17