結果
問題 | No.1390 Get together |
ユーザー |
![]() |
提出日時 | 2021-02-12 21:46:15 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 111 ms / 2,000 ms |
コード長 | 3,424 bytes |
コンパイル時間 | 2,050 ms |
コンパイル使用メモリ | 205,544 KB |
最終ジャッジ日時 | 2025-01-18 18:17:19 |
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 29 |
ソースコード
#include <bits/stdc++.h>using namespace std;#define REP(i,n) for(ll i=0;i<(ll)n;i++)#define dump(x) cerr << "Line " << __LINE__ << ": " << #x << " = " << (x) << "\n";#define spa << " " <<#define fi first#define se second#define ALL(a) (a).begin(),(a).end()#define ALLR(a) (a).rbegin(),(a).rend()using ld = long double;using ll = long long;using ull = unsigned long long;using pii = pair<int, int>;using pll = pair<ll, ll>;using pdd = pair<ld, ld>;template<typename T> using V = vector<T>;template<typename T> using P = pair<T, T>;template<typename T> vector<T> make_vec(size_t n, T a) { return vector<T>(n, a); }template<typename... Ts> auto make_vec(size_t n, Ts... ts) { return vector<decltype(make_vec(ts...))>(n, make_vec(ts...)); }template<class S, class T> ostream& operator << (ostream& os, const pair<S, T> v){os << "(" << v.first << ", " << v.second << ")"; return os;}template<typename T> ostream& operator<<(ostream &os, const vector<T> &v) { for (auto &e : v) os << e << ' '; return os; }template<class T> ostream& operator<<(ostream& os, const vector<vector<T>> &v){ for(auto &e : v){os << e << "\n";} return os;}struct fast_ios { fast_ios(){ cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;template <class T> void UNIQUE(vector<T> &x) {sort(ALL(x));x.erase(unique(ALL(x)), x.end());}template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }void fail() { cout << -1 << '\n'; exit(0); }inline int popcount(const int x) { return __builtin_popcount(x); }inline int popcount(const ll x) { return __builtin_popcountll(x); }template<typename T> void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++){cerr<<v[i][0];for(ll j=1;j<w;j++)cerr spa v[i][j];cerr<<"\n";}};template<typename T> void debug(vector<T>&v,ll n){if(n!=0)cerr<<v[0];for(ll i=1;i<n;i++)cerr spa v[i];cerr<<"\n";};const ll INF = (1ll<<62);// const ld EPS = 1e-10;// const ld PI = acos(-1.0);const ll mod = (int)1e9 + 7;//const ll mod = 998244353;// par[i] ·は,iがrootなら-(連結成分のサイズ)を,iがrootではないならばrootを返す// root(x) は必ずroot を返すstruct UnionFindSize {vector<int> par;UnionFindSize(int n) : par(n, -1) { }void init(int n) { par.assign(n, -1); }int root(int x) {if (par[x] < 0) return x;else return par[x] = root(par[x]);}bool issame(int x, int y) {return root(x) == root(y);}bool merge(int x, int y) {x = root(x); y = root(y);if (x == y) return false;if (par[x] > par[y]) swap(x, y); // merge techniquepar[x] += par[y];par[y] = x;return true;}int size(int x) {return -par[root(x)];}void print(){cout << "uf: ";for(int i=0;i<(int)par.size();i++) cout << root(i) << " ";cout << endl;}};int main(){ll N, M;cin >> N >> M;V<ll> b(N), c(N);REP(i, N) cin >> b[i] >> c[i], b[i]--, c[i]--;UnionFindSize uf(N+M);REP(i, N){uf.merge(c[i], N+b[i]);}map<ll, ll> mp;REP(i, M){mp[uf.root(N+i)]++;}ll res = 0;for(auto x: mp) res += (x.second-1);cout << res << endl;return 0;}