結果
| 問題 |
No.1390 Get together
|
| コンテスト | |
| ユーザー |
 mjtai
|
| 提出日時 | 2021-02-26 11:20:41 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 76 ms / 2,000 ms |
| コード長 | 6,261 bytes |
| コンパイル時間 | 2,065 ms |
| コンパイル使用メモリ | 212,156 KB |
| 最終ジャッジ日時 | 2025-01-19 04:36:17 |
|
ジャッジサーバーID （参考情報） |
judge2 / judge2 |
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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>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
using namespace std;
///////////////////////////////////////////////////////////////////////////////
#define DEBUG 0
#define pb push_back
#define V vector
#define S static
#define rep(i,n) for(ll i=0LL; i<n; ++i)
#define srep(i,s,n) for(ll i=s; i<n; ++i)
#define rrep(i,n) for(ll i=n-1LL; i>=0LL; --i)
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define CIN(x) do { \
assert(!cin.eof()); \
cin >> x; \
assert(!cin.fail()); \
} while(0);
#if DEBUG
#define debug_print(...) _debug_print(__VA_ARGS__)
#define debug_printf(...) printf(__VA_ARGS__)
#define debug_print_time _debug_print_time
#else // DEBUG
#define debug_print(...)
#define debug_printf(...)
#define debug_print_time
#endif // DEBUG
typedef long long ll;
typedef unsigned long long ull;
typedef __int128_t ll128;
typedef tuple<ll, ll> t2;
typedef tuple<ll, ll, ll> t3;
typedef tuple<ll, ll, ll, ll> t4;
typedef tuple<ll, ll, ll, ll, ll> t5;
template <typename T>
using priority_queue_incr = priority_queue<T, V<T>, greater<T> >;
///////////////////////////////////////////////////////////////////////////////
template <typename TT, typename T>
void incr_m(map<TT, T> &m, TT k)
{
if (m.find(k) == m.end()) m[k] = 0;
m[k]++;
}
void llin(ll &a)
{
CIN(a);
}
void llinl1(V<ll> &v, ll count)
{
for (ll i = 0LL; i < count; ++i) {
ll a;
CIN(a);
v.push_back(a);
}
}
void llinl2(V<t2> &v, ll count)
{
for (ll i = 0LL; i < count; ++i) {
ll a, b;
CIN(a >> b);
v.push_back(t2(a, b));
}
}
void llinl3(V<t3> &v, ll count)
{
for (ll i = 0LL; i < count; ++i) {
ll a, b, c;
CIN(a >> b >> c);
v.push_back(t3(a, b, c));
}
}
void llinl4(V<t4> &v, ll count)
{
for (ll i = 0LL; i < count; ++i) {
ll a, b, c, d;
CIN(a >> b >> c >> d);
v.push_back(t4(a, b, c, d));
}
}
void llina(V<ll> &v, ll count)
{
llinl1(v, count);
}
template <typename T>
void sort(V<T> &v)
{
sort(v.begin(), v.end());
}
template <typename T>
void sort_reverse(V<T> &v)
{
sort(v.begin(), v.end(), greater<T>());
}
t2 _ext_gcd(ll a, ll b, ll g)
{
if (!b) return t2(1, 0);
ll q = a / b;
ll r = a % b;
t2 sol = _ext_gcd(b, r, g);
ll sx = get<0>(sol);
ll sy = get<1>(sol);
ll x = sy;
ll y = sx - q * sy;
return t2(x, y);
}
t2 ext_gcd(ll a, ll b)
{
return _ext_gcd(a, b, gcd(a, b));
}
// x and mod must be coprime
ll mod_inv(ll x, ll mod)
{
t2 result = ext_gcd(x, mod);
ll ret = get<0>(result);
while (ret < 0) ret += mod;
ret %= mod;
return ret;
}
ll msec()
{
struct timeval tv;
gettimeofday(&tv, NULL);
ll ret = 0;
ret += tv.tv_sec * 1000LL;
ret += tv.tv_usec / 1000LL;
return ret;
}
template <typename T>
void _debug_print(T x)
{
cout << x << " ";
}
void _debug_print(const t2 &x)
{
ll x1 = get<0>(x);
ll x2 = get<1>(x);
cout << "(" << x1 << ", " << x2 << ") ";
}
void _debug_print(const t3 &x)
{
ll x1 = get<0>(x);
ll x2 = get<1>(x);
ll x3 = get<2>(x);
cout << "(" << x1 << ", " << x2 << ", " << x3 << ") ";
}
void _debug_print(const t4 &x)
{
ll x1 = get<0>(x);
ll x2 = get<1>(x);
ll x3 = get<2>(x);
ll x4 = get<3>(x);
cout << "(" << x1 << ", " << x2 << ", " << x3 << ", " << x4 << ") ";
}
template <typename T>
void _debug_print(T xarray[], ll n)
{
rep (i, n) _debug_print(xarray[i]);
cout << endl;
}
template <typename T>
void _debug_print(const V<T> &xlist)
{
for (auto x : xlist) _debug_print(x);
cout << endl;
}
template <typename T>
void _debug_print(const set<T> &xset)
{
for (auto x : xset) _debug_print(x);
cout << endl;
}
template <typename TT, typename T>
void _debug_print(const map<TT, T> &xlist)
{
for (auto x : xlist) {
TT k = x.first;
T v = x.second;
cout << "K=";
_debug_print(k);
cout << " V=";
_debug_print(v);
cout << endl;
}
}
struct UnionFind
{
ull *parent, *count, *rank;
UnionFind(ull n) {
parent = new ull[n+1];
count = new ull[n+1];
rank = new ull[n+1];
for (ull i = 0ULL; i < n+1; ++i) {
parent[i] = i;
count[i] = 1;
rank[i] = 0;
}
}
~UnionFind() {
delete rank;
delete count;
delete parent;
}
ull root(ull i) {
if (parent[i] == i) return i;
parent[i] = root(parent[i]);
return parent[i];
}
void unite(ull i, ull j) {
ull rooti = root(i);
ull rootj = root(j);
if (rooti == rootj) return;
if (rank[rootj] < rank[rooti]) {
parent[i] = parent[j] = parent[rootj] = rooti;
count[rooti] += count[rootj];
}
else {
parent[i] = parent[j] = parent[rooti] = rootj;
count[rootj] += count[rooti];
if (rank[rootj] == rank[rooti]) rank[rootj]++;
}
}
bool same(ull i, ull j) {
return root(i) == root(j);
}
};
///////////////////////////////////////////////////////////////////////////////
void _main();
int main()
{
cout << setprecision(12);
#if !DEBUG
ios::sync_with_stdio(false);
cin.tie(0);
#endif
_main();
return 0;
}
void _main()
{
ll n; llin(n);
ll m; llin(m);
V<t2> bclist; llinl2(bclist, n);
S V<ll> btoc[200010];
for (auto bc : bclist) {
ll b, c; tie(b, c) = bc;
btoc[b].pb(c);
}
UnionFind uf(200010LL);
rep (b, 200010LL) for (auto c : btoc[b]) uf.unite(btoc[b][0], c);
S ll ctocc[200010];
rep (c, 200010) ctocc[c] = uf.root(c);
S ll cnts[200010] = {};
rep (b, 200010) {
if (btoc[b].empty()) continue;
ll c = btoc[b][0];
ll cc = ctocc[c];
cnts[cc]++;
}
ll ans = 0;
rep (cc, 200010) {
if (!cnts[cc]) continue;
ans += cnts[cc] - 1LL;
}
cout << ans << endl;
}
///////////////////////////////////////////////////////////////////////////////