結果
問題 | No.1390 Get together |
ユーザー |
|
提出日時 | 2021-02-12 21:29:47 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 148 ms / 2,000 ms |
コード長 | 3,915 bytes |
コンパイル時間 | 2,073 ms |
コンパイル使用メモリ | 204,300 KB |
最終ジャッジ日時 | 2025-01-18 18:02:30 |
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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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(int i=0; i<(n); ++i)#define RREP(i, n) for(int i=(n);i>=0;--i)#define FOR(i, a, n) for (int i=(a); i<(n); ++i)#define RFOR(i, a, b) for(int i=(a);i>=(b);--i)#define SZ(x) ((int)(x).size())#define ALL(x) (x).begin(),(x).end()#define DUMP(x) cerr<<#x<<" = "<<(x)<<endl#define DEBUG(x) cerr<<#x<<" = "<<(x)<<" (L"<<__LINE__<<")"<<endl;template<class T>ostream &operator<<(ostream &os, const vector<T> &v) {REP(i, SZ(v)) {if (i) os << " ";os << v[i];}return os;}template <class T>void debug(const vector<T> &v) {cout << "[";REP(i, SZ(v)) {if(i) cout << ", ";cout << v[i];}cout << "]" << endl;}template<class T, class U>ostream &operator<<(ostream &os, const pair<T, U> &p) {return os << p.first << " " << p.second;}template <class T, class U>void debug(const pair<T, U> &p) {cout << "(" << p.first << " " << p.second << ")" << endl;}template<class T>bool chmax(T &a, const T &b) {if (a < b) {a = b;return true;}return false;}template<class T>bool chmin(T &a, const T &b) {if (b < a) {a = b;return true;}return false;}using ll = long long;using ull = unsigned long long;using ld = long double;using P = pair<int, int>;using vi = vector<int>;using vll = vector<ll>;using vvi = vector<vi>;using vvll = vector<vll>;const ll MOD = 1e9 + 7;const ll MOD998 = 998244353;const int INF = INT_MAX;const ll LINF = LLONG_MAX;const int inf = INT_MIN;const ll linf = LLONG_MIN;const ld eps = 1e-9;template<int m>struct mint {int x;mint(ll x = 0) : x(((x % m) + m) % m) {}mint operator-() const { return x ? m - x : 0; }mint &operator+=(mint r) {if ((x += r.x) >= m) x -= m;return *this;}mint &operator-=(mint r) {if ((x -= r.x) < 0) x += m;return *this;}mint &operator*=(mint r) {x = ((ll) x * r.x) % m;return *this;}mint inv() const { return pow(m - 2); }mint &operator/=(mint r) { return *this *= r.inv(); }friend mint operator+(mint l, mint r) { return l += r; }friend mint operator-(mint l, mint r) { return l -= r; }friend mint operator*(mint l, mint r) { return l *= r; }friend mint operator/(mint l, mint r) { return l /= r; }mint pow(ll n) const {mint ret = 1, tmp = *this;while (n) {if (n & 1) ret *= tmp;tmp *= tmp, n >>= 1;}return ret;}friend bool operator==(mint l, mint r) { return l.x == r.x; }friend bool operator!=(mint l, mint r) { return l.x != r.x; }friend ostream &operator<<(ostream &os, mint a) {return os << a.x;}friend istream &operator>>(istream &is, mint &a) {ll x;is >> x;a = x;return is;}};using Int = mint<MOD>;struct UnionFind {int n;vi par;UnionFind(int n): n(n) {par.resize(n, -1);}int root(int x) {return par[x] < 0 ? x : par[x] = root(par[x]);}void unite(int x, int y) {x = root(x);y = root(y);if(x == y) return;if(par[x] < par[y]) swap(x, y);par[y] += par[x];par[x] = y;}bool same(int x, int y) {return root(x) == root(y);}};int main() {cin.tie(0);ios::sync_with_stdio(false);cout << fixed << setprecision(10);int n, m; cin >> n >> m;UnionFind uf(m);vvi v(n);REP(i, n) {int b, c; cin >> b >> c;b--; c--;v[c].push_back(b);}REP(i, n) {REP(j, SZ(v[i])-1) {uf.unite(v[i][j], v[i][j+1]);}}set<int> st;REP(i, m) {st.insert(uf.root(i));}int ans = 0;for(auto &e: st) {ans += (-uf.par[e]) - 1;}cout << ans << endl;return 0;}