Submission #1205780

#	Time	Username	Problem	Language	Result	Execution time	Memory
1205780		mychecksedad	Making Friends on Joitter is Fun (JOI20_joitter2)	C++20	0 / 100	0 ms	320 KiB

joitter2

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define cerr if(false) cerr
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
#define ff first
#define ss second
#define pii pair<int,int>
#define vi vector<int>
const int N = 5000+100, M = 1e5+10, K = 52, MX = 30;

struct Dsu {
  vector<int> s, p;
  int sz;
  Dsu(int n){
    sz = n;
    s.resize(n+1, 1);
    p.resize(n+1);
    for(int i = 0; i <= n; ++i) p[i] = i;
  }
  int find(int v){
    if(p[v] == v) return v;
    return (p[v] = find(p[v]));
  }
  void merge(int a, int b){
    a = find(a);
    b = find(b);
    if(a != b){
      if(s[a] > s[b]){
        swap(a, b);
      }
      s[b] += s[a];
      p[a] = b;
      sz--;
    }
  }
};

int n, m;
vector<pii> E;
bitset<N> is[N];
void solve(){
  cin >> n >> m;
  Dsu d(n);
  for(int i = 1; i <= m; ++i){
    int u, v; cin >> u >> v;
    bool ok = false;
    for(auto [x, y]: E){
      if(d.find(x) == d.find(v) && y == d.find(u)){
        ok = 1;
        break;
      }
    }
    E.pb({u, d.find(v)});
    if(ok){
      d.merge(u, v);
      for(auto &[x, y]: E){
        x = d.find(x);
        y = d.find(y);
      }
    }
    vector<vi> g(n+1);
    for(auto [x, y]: E){
      if(d.find(x) != d.find(y)) g[x].pb(d.find(y));
    }
    int ans = 0;
    for(int j = 1; j <= n; ++j){
      sort(all(g[j]));
      g[j].erase(unique(all(g[j])), g[j].end());
      for(int y: g[j]) ans += d.s[y];
      if(d.find(j) == j){
        ans += d.s[j] * d.s[j] - d.s[j];
      }
    }
    cout << ans << '\n';
  }
}


int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

• Subtask 1: 0 / 1
• Subtask 2: 0 / 16
• Subtask 3: 0 / 83