結果
問題 | No.1390 Get together |
ユーザー |
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提出日時 | 2021-02-12 21:38:06 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 64 ms / 2,000 ms |
コード長 | 3,175 bytes |
コンパイル時間 | 2,358 ms |
コンパイル使用メモリ | 196,332 KB |
最終ジャッジ日時 | 2025-01-18 18:09:10 |
ジャッジサーバーID (参考情報) |
judge3 / 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;using int64 = long long;const int mod = 1e9 + 7;// const int mod = 998244353;const int64 infll = (1LL << 62) - 1;const int inf = (1 << 30) - 1;struct IoSetup {IoSetup() {cin.tie(nullptr);ios::sync_with_stdio(false);cout << fixed << setprecision(10);cerr << fixed << setprecision(10);}} iosetup;template< typename T1, typename T2 >ostream &operator<<(ostream &os, const pair< T1, T2 > &p) {os << p.first << " " << p.second;return os;}template< typename T1, typename T2 >istream &operator>>(istream &is, pair< T1, T2 > &p) {is >> p.first >> p.second;return is;}template< typename T >ostream &operator<<(ostream &os, const vector< T > &v) {for(int i = 0; i < (int) v.size(); i++) {os << v[i] << (i + 1 != v.size() ? " " : "");}return os;}template< typename T >istream &operator>>(istream &is, vector< T > &v) {for(T &in : v) is >> in;return is;}template< typename T1, typename T2 >inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }template< typename T1, typename T2 >inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }template< typename T = int64 >vector< T > make_v(size_t a) {return vector< T >(a);}template< typename T, typename... Ts >auto make_v(size_t a, Ts... ts) {return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));}template< typename T, typename V >typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {t = v;}template< typename T, typename V >typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {for(auto &e : t) fill_v(e, v);}template< typename F >struct FixPoint : F {FixPoint(F &&f) : F(forward< F >(f)) {}template< typename... Args >decltype(auto) operator()(Args &&... args) const {return F::operator()(*this, forward< Args >(args)...);}};template< typename F >inline decltype(auto) MFP(F &&f) {return FixPoint< F >{forward< F >(f)};}/*** @brief Union-Find* @docs docs/union-find.md*/struct UnionFind {vector< int > data;UnionFind() = default;explicit UnionFind(size_t sz) : data(sz, -1) {}bool unite(int x, int y) {x = find(x), y = find(y);if(x == y) return false;if(data[x] > data[y]) swap(x, y);data[x] += data[y];data[y] = x;return true;}int find(int k) {if(data[k] < 0) return (k);return data[k] = find(data[k]);}int size(int k) {return -data[find(k)];}bool same(int x, int y) {return find(x) == find(y);}};int main() {int N, M;cin >> N >> M;vector< int > B(N), C(N);UnionFind uf(N);vector< int > last(M, -1);for(int i = 0; i < N; i++) {cin >> B[i] >> C[i];--B[i], --C[i];if(~last[B[i]]) {uf.unite(last[B[i]], C[i]);}last[B[i]] = C[i];}vector< int > used1(N), used2(M);int ret = 0;for(int i = 0; i < N; i++) {if(used2[B[i]]) {continue;}used2[B[i]] = true;C[i] = uf.find(C[i]);if(used1[C[i]]) {++ret;}used1[C[i]] = true;}cout << ret << "\n";}