Submission #1206577

#	Time	Username	Problem	Language	Result	Execution time	Memory
1206577		hyakup	Closing Time (IOI23_closing)	C++20	9 / 100	1096 ms	30248 KiB

closing

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

const int maxn = 2e5;

using ll = long long;
using pll = pair<ll, int>;

const ll inf = 1e18;

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

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

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

int max_score(int n, int x, int y, long long val, 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 );

  vector<ll> s1(n + 1), s2(n + 1);
  for( int i = 0; i < n; i++ ){
    s1[i + 1] = min( dist[0][i], dist[1][i] ) + s1[i];
    s2[i + 1] = abs( dist[0][i] - dist[1][i] ) + s2[i];
  }

  int resp = 0;
  for( int i = 0; i <= x; i++ ){
    for( int j = y; j < n; j++ ){
      for( int k = x; k < n; k++ ){
        for( int l = 0; l <= y; l++ ){

          ll sum;
          if( k < l ){
            sum = s1[k + 1] - s1[i] + s1[j + 1] - s1[l];
          }
          else{
            sum = s1[max(j, k) + 1] - s1[min(i, l)] + s2[min(j, k) + 1] - s2[max(i, l)];
          }

          if( sum <= val ){
            resp = max( resp, k - i + 1 + j - l + 1 );
          }
        }
      }
    }
  }

  return resp;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 8
• Subtask 2: 9 / 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