結果
問題 | No.1390 Get together |
ユーザー | RheoTommy |
提出日時 | 2021-02-12 22:46:15 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 142 ms / 2,000 ms |
コード長 | 4,256 bytes |
コンパイル時間 | 2,846 ms |
コンパイル使用メモリ | 201,136 KB |
最終ジャッジ日時 | 2025-01-18 19:15:01 |
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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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
//@formatter:off #include<bits/stdc++.h> #define overload4(_1, _2, _3, _4, name, ...) name #define rep1(i, n) for (ll i = 0; i < ll(n); ++i) #define rep2(i, s, n) for (ll i = ll(s); i < ll(n); ++i) #define rep3(i, s, n, d) for(ll i = ll(s); i < ll(n); i+=d) #define rep(...) overload4(__VA_ARGS__,rep3,rep2,rep1)(__VA_ARGS__) #define rrep(i, n) for (ll i = ll(n)-1; i >= 0; i--) #define all(a) a.begin(),a.end() #define rall(a) a.rbegin(),a.rend() #define popcount(x) __builtin_popcount(x) #define pb push_back #define eb emplace_back #ifdef __LOCAL #define debug(...) { cout << #__VA_ARGS__; cout << ": "; print(__VA_ARGS__); cout << flush; } #else #define debug(...) void(0) #endif #define INT(...) int __VA_ARGS__;scan(__VA_ARGS__) #define LL(...) ll __VA_ARGS__;scan(__VA_ARGS__) #define STR(...) string __VA_ARGS__;scan(__VA_ARGS__) #define CHR(...) char __VA_ARGS__;scan(__VA_ARGS__) #define DBL(...) double __VA_ARGS__;scan(__VA_ARGS__) #define LD(...) ld __VA_ARGS__;scan(__VA_ARGS__) using namespace std; using ll = long long; using ld = long double; using P = pair<int, int>; using LP = pair<ll, ll>; using vi = vector<int>; using vvi = vector<vector<int>>; using vl = vector<ll>; using vvl = vector<vector<ll>>; using vd = vector<double>; using vvd = vector<vector<double>>; using vs = vector<string>; using vc = vector<char>; using vvc = vector<vector<char>>; using vb = vector<bool>; using vvb = vector<vector<bool>>; using vp = vector<P>; using vvp = vector<vector<P>>; template<class S, class T> istream &operator>>(istream &is, pair<S, T> &p) { return is >> p.first >> p.second; } template<class S, class T> ostream &operator<<(ostream &os, const pair<S, T> &p) { return os << '{' << p.first << "," << p.second << '}'; } template<class T> istream &operator>>(istream &is, vector<T> &v) { for (T &t:v) { is >> t; } return is; } template<class T> ostream &operator<<(ostream &os, const vector<T> &v) { os << '['; rep(i, v.size())os << v[i] << (i == int(v.size() - 1) ? "" : ","); return os << ']'; } template<class T> void vecout(const vector<T> &v, char div = '\n') { rep(i, v.size()) cout << v[i] << (i == int(v.size() - 1) ? '\n' : div); } template<class T> bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; } template<class T> bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; } void scan() {} template<class Head, class... Tail> void scan(Head &head, Tail &... tail) { cin >> head; scan(tail...); } template<class T> void print(const T &t) { cout << t << '\n'; } template<class Head, class... Tail> void print(const Head &head, const Tail &... tail) { cout << head << ' '; print(tail...); } template<class... T> void fin(const T &... a) { print(a...); exit(0); } const string yes[] = {"no", "yes"}; const string Yes[] = {"No", "Yes"}; const string YES[] = {"NO", "YES"}; const int inf = 1001001001; const ll linf = 1001001001001001001; //@formatter:on class unionfind { int n; vector<int> par, rank; public: unionfind(int n) : n(n), par(n, -1), rank(n, 0) {} int root(int x) { if (par[x] < 0) return x; else return par[x] = root(par[x]); } bool same(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 (rank[x] < rank[y]) swap(x, y); if (rank[x] == rank[y]) rank[x]++; par[x] += par[y]; par[y] = x; return true; } int size(int x) { return -par[root(x)]; }; bool connected() { rep(i, n - 1) if (!same(i, i + 1)) return false; return true; } }; int main() { ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); LL(n, m); vvl v(n); unionfind uf(m); rep(i, n) { LL(b, c); b--; c--; v[c].push_back(b); } rep(i, n) { if (v[i].empty()) continue; ll j = v[i][0]; for (auto ji:v[i]) uf.merge(j, ji); } ll ans = 0; rep(i, m) { if (uf.root(i) == i) ans += uf.size(i) - 1; } print(ans); }