Submission #640236

#	Time	Username	Problem	Language	Result	Execution time	Memory
640236		devariaota	Stranded Far From Home (BOI22_island)	C++17	0 / 100	198 ms	17124 KiB

island

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
typedef long long ll;
// const ll mod = 1e9 + 7;
const ll MAXN = 2e5 + 5;
#define vi vector<int>
#define vll vector<ll>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define mp make_pair
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define fi first
#define sc second
#define endl '\n'
#define gl                        ios_base::sync_with_stdio(0);   cin.tie(0);                     cout.tie(0)

int n, m, u, v;
vi adj[MAXN];
int par[MAXN];
ll val[MAXN];
bool vis[MAXN];

priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>>> pq;

int fpar(int a)
{
  return par[a] = (par[a] == a ? a : fpar(par[a]));
}

int main()
{
  gl;
  cin >> n >> m;

  ll mx = 0;
  for (int i = 1; i <= n; i++)
  {
    cin >> val[i];
    par[i] = i;
    pq.push({val[i], i});
    mx = max(mx, val[i]);
  }

  for (int i = 1; i <= m; i++)
  {
    cin >> u >> v;
    adj[u].pb(v);
    adj[v].pb(u);
  }

  while (!pq.empty())
  {
    auto [va, idx] = pq.top();
    // cout << ":: " << va << ' ' << idx << endl;
    pq.pop();
    vis[idx] = 1;
    if (va != val[fpar(par[idx])])
      continue;
    for (int i : adj[idx])
    {
      if (!vis[i] and val[fpar(par[idx])] >= val[fpar(par[i])])
      {
        vis[i] = 1;
        val[i] += va;
        par[idx] = fpar(par[i]);
        pq.push({val[i], i});
      }
    }
  }

  for (int i = 1; i <= n; i++)
  {
    if (val[fpar(par[i])] >= mx)
      cout << 1;
    else
      cout << 0;
  }

  cout << endl;

  // for (int i = 1; i <= n; i++)
  // {
  //   cout << par[i] << ' ';
  // }
  // cout << endl;

  return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35