結果

問題 No.1390 Get together
ユーザー r1933r1933
提出日時 2021-02-12 21:43:13
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 154 ms / 2,000 ms
コード長 6,049 bytes
コンパイル時間 3,711 ms
コンパイル使用メモリ 223,116 KB
最終ジャッジ日時 2025-01-18 18:13:23
ジャッジサーバーID
(参考情報)
judge1 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 29
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#pragma GCC optimize("Ofast")
#include "bits/stdc++.h"
// Begin Header {{{
using namespace std;
#ifndef DEBUG
#define dump(...)
#endif
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define rep(i, b, e) for (intmax_t i = (b), i##_limit = (e); i < i##_limit; ++i)
#define repc(i, b, e) for (intmax_t i = (b), i##_limit = (e); i <= i##_limit; ++i)
#define repr(i, b, e) for (intmax_t i = (b), i##_limit = (e); i >= i##_limit; --i)
#define var(Type, ...) Type __VA_ARGS__; input(__VA_ARGS__)
constexpr size_t operator""_zu(unsigned long long value) { return value; };
constexpr intmax_t operator""_jd(unsigned long long value) { return value; };
constexpr uintmax_t operator""_ju(unsigned long long value) { return value; };
constexpr int INF = 0x3f3f3f3f;
constexpr intmax_t LINF = 0x3f3f3f3f3f3f3f3f_jd;
template <class T, class Compare = less<>>
using MaxHeap = priority_queue<T, vector<T>, Compare>;
template <class T, class Compare = greater<>>
using MinHeap = priority_queue<T, vector<T>, Compare>;
inline void input() {}
template <class Head, class... Tail>
inline void input(Head&& head, Tail&&... tail) {
cin >> head;
input(forward<Tail>(tail)...);
}
template <class Container, class Value = typename Container::value_type,
enable_if_t<!is_same<Container, string>::value, nullptr_t> = nullptr>
inline istream& operator>>(istream &is, Container &vs) {
for (auto &v: vs) is >> v;
return is;
}
template <class T, class U>
inline istream& operator>>(istream &is, pair<T, U> &p) {
is >> p.first >> p.second;
return is;
}
inline void output() { cout << "\n"; }
template <class Head, class... Tail>
inline void output(Head&& head, Tail&&... tail) {
cout << head;
if (sizeof...(tail)) cout << " ";
output(forward<Tail>(tail)...);
}
template <class Container, class Value = typename Container::value_type,
enable_if_t<!is_same<Container, string>::value, nullptr_t> = nullptr>
inline ostream& operator<<(ostream &os, const Container &vs) {
static constexpr const char *delim[] = {" ", ""};
for (auto it = begin(vs); it != end(vs); ++it) {
os << delim[it == begin(vs)] << *it;
}
return os;
}
template <class Iterator>
inline void join(const Iterator &Begin, const Iterator &End, const string &delim = "\n", const string &last = "\n") {
for (auto it = Begin; it != End; ++it) {
cout << ((it == Begin) ? "" : delim) << *it;
}
cout << last;
}
template <class T>
inline vector<T> makeVector(const T &init_value, size_t sz) {
return vector<T>(sz, init_value);
}
template <class T, class... Args>
inline auto makeVector(const T &init_value, size_t sz, Args... args) {
return vector<decltype(makeVector<T>(init_value, args...))>(sz, makeVector<T>(init_value, args...));
}
template <class Func>
class FixPoint : Func {
public:
explicit constexpr FixPoint(Func&& f) noexcept : Func(forward<Func>(f)) {}
template <class... Args>
constexpr decltype(auto) operator()(Args&&... args) const {
return Func::operator()(*this, std::forward<Args>(args)...);
}
};
template <class Func>
static inline constexpr decltype(auto) makeFixPoint(Func&& f) noexcept {
return FixPoint<Func>{forward<Func>(f)};
}
template <class Container>
struct reverse_t {
Container &c;
reverse_t(Container &c) : c(c) {}
auto begin() { return c.rbegin(); }
auto end() { return c.rend(); }
};
template <class Container>
auto reversed(Container &c) {
return reverse_t<Container>(c);
}
template <class T>
inline bool chmax(T &a, const T &b) noexcept {
return b > a && (a = b, true);
}
template <class T>
inline bool chmin(T &a, const T &b) noexcept {
return b < a && (a = b, true);
}
template <class T>
inline T diff(const T &a, const T &b) noexcept {
return a < b ? b - a : a - b;
}
void operator|=(vector<bool>::reference lhs, const bool rhs) {
lhs = lhs | rhs;
}
void ioinit() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout << fixed << setprecision(10);
cerr << fixed << setprecision(10);
clog << fixed << setprecision(10);
}
// }}} End Header
// DisjointSet {{{
struct DisjointSet {
const size_t n;
mutable vector<int> c;
explicit DisjointSet(const size_t n) : n(n), c(n, -1) {}
size_t size(size_t v) const {
assert(v < n);
return -c[root(v)];
}
size_t root(size_t v) const {
assert(v < n);
return (c[v] < 0) ? v : c[v] = root(c[v]);
}
bool connected(size_t u, size_t v) const {
assert(u < n);
assert(v < n);
return root(u) == root(v);
}
size_t unite(size_t u, size_t v) {
assert(u < n);
assert(v < n);
u = root(u);
v = root(v);
if (u == v) return u;
if (-c[u] < -c[v]) swap(u, v);
c[u] += c[v];
c[v] = u;
return u;
}
vector<vector<size_t>> groups() {
vector<size_t> roots(n), group_size(n);
for (size_t i = 0; i < n; ++i) {
roots[i] = root(i);
group_size[roots[i]]++;
}
vector<vector<size_t>> res(n);
for (size_t i = 0; i < n; ++i) {
res[i].reserve(group_size[i]);
}
for (size_t i = 0; i < n; ++i) {
res[roots[i]].emplace_back(i);
}
res.erase(
remove_if(res.begin(), res.end(),
[&](const auto& v) { return v.empty(); }),
res.end());
return res;
}
};
// }}}
int main() {
ioinit();
var(size_t, N, M);
vector<vector<int>> box_by_color(N);
vector<int> bs(N), cs(N);
rep(i, 0, N) {
input(bs[i], cs[i]);
bs[i]--, cs[i]--;
box_by_color[cs[i]].emplace_back(bs[i]);
}
DisjointSet ds(M);
rep(c, 0, N) {
rep(i, 1, box_by_color[c].size()) ds.unite(box_by_color[c][i - 1], box_by_color[c][i]);
}
const auto gs = ds.groups();
int res = 0;
for (const auto g: gs) {
res += g.size() - 1;
}
output(res);
return 0;
}
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