Submission #766875

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
766875	2023-06-26 08:27:05	onjo0127	Making Friends on Joitter is Fun (JOI20_joitter2)	C++17	100 / 100	1287 ms	160660 KiB

joitter2

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#include <bits/stdc++.h>
#define sz(V) ((int)V.size())
using namespace std;
using pii = pair<int, int>;
using ll = long long;
int P[100009];
set<int> I[100009], A[100009], II[100009], OO[100009];
ll ans;
int root(int x) {
  if(P[x] == x) return x;
  return P[x] = root(P[x]);
}
ll f(int x) {
  return 1LL * sz(A[x]) * (sz(I[x]) + sz(A[x]) - 1);
}
void merg(int u, int v) {
  u = root(u); v = root(v);
  if(u == v) return;
  if(sz(A[u]) + sz(I[u]) + sz(II[u]) + sz(OO[u]) > sz(A[v]) + sz(I[v]) + sz(II[v]) + sz(OO[v])) swap(u, v);
  ans -= f(u) + f(v);
  for(auto& it: A[u]) if(I[v].find(it) != I[v].end()) I[v].erase(it);
  for(auto& it: I[u]) if(A[v].find(it) == A[v].end()) I[v].insert(it);
  for(auto& it: A[u]) A[v].insert(it);
  set<int> Q;
  for(auto& it: II[u]) if(it != u && it != v) {
    OO[it].erase(u);
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

joitter2.cpp: In function 'int main()':
joitter2.cpp:47:17: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  int N, M; scanf("%d%d", &N, &M);
      |            ~~~~~^~~~~~~~~~~~~~~~
joitter2.cpp:53:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |   int u, v; scanf("%d%d", &u, &v);
      |             ~~~~~^~~~~~~~~~~~~~~~

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