結果

問題 No.1605 Matrix Shape
ユーザー Aoxiang Cui
提出日時 2021-08-28 21:50:23
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 243 ms / 2,000 ms
コード長 4,260 bytes
コンパイル時間 1,586 ms
コンパイル使用メモリ 122,364 KB
実行使用メモリ 14,464 KB
最終ジャッジ日時 2024-11-21 22:02:29
合計ジャッジ時間 5,829 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge3
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 * 34
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function 'int main()':
main.cpp:139:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
  139 |   for (auto& [k, v] : deg) {
      |              ^

ソースコード

diff #
プレゼンテーションモードにする

#define LOCAL
#define _USE_MATH_DEFINES
#include <array>
#include <cassert>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>
#include <vector>
#include <queue>
#include <stack>
#include <list>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <algorithm>
#include <complex>
#include <cmath>
#include <numeric>
#include <bitset>
#include <functional>
#include <random>
#include <ctime>
using namespace std;
template <typename A, typename B>
ostream& operator <<(ostream& out, const pair<A, B>& a) {
  out << "(" << a.first << "," << a.second << ")";
  return out;
}
template <typename T, size_t N>
ostream& operator <<(ostream& out, const array<T, N>& a) {
  out << "["; bool first = true;
  for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";
  return out;
}
template <typename T>
ostream& operator <<(ostream& out, const vector<T>& a) {
  out << "["; bool first = true;
  for (auto v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";
  return out;
}
template <typename T, class Cmp>
ostream& operator <<(ostream& out, const set<T, Cmp>& a) {
  out << "{"; bool first = true;
  for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "}";
  return out;
}
template <typename U, typename T, class Cmp>
ostream& operator <<(ostream& out, const map<U, T, Cmp>& a) {
  out << "{"; bool first = true;
  for (auto& p : a) { out << (first ? "" : ", "); out << p.first << ":" << p.second; first = 0;} out << "}";
  return out;
}
#ifdef LOCAL
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
#else
#define trace(...) 42
#endif
template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
  cerr << name << ": " << arg1 << endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
  const char* comma = strchr(names + 1, ',');
  cerr.write(names, comma - names) << ": " << arg1 << " |";
  __f(comma + 1, args...);
}
template <class T> auto vect(const T& v, int n) { return vector<T>(n, v); }
template <class T, class... D> auto vect(const T& v, int n, D... m) {
  return vector<decltype(vect(v, m...))>(n, vect(v, m...));
}
typedef long long int64;
typedef pair<int, int> ii;
#define SZ(x) (int)((x).size())
template <typename T> static constexpr T inf = numeric_limits<T>::max() / 2;
const int MOD = 1e9 + 7;
// const int MOD = 998244353;
mt19937 mrand(random_device{}());
int rnd(int x) { return mrand() % x; }
// mt19937_64 mrand(random_device{}());
// int64 rnd(int64 x) { return mrand() % x; }
template <class T> void out(const vector<T>& a) { for (int i = 0; i < SZ(a); ++i) cout << a[i] << " \n"[i + 1 == SZ(a)]; }
template <class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template <class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
template <class T> void dedup(vector<T>& v) { sort(v.begin(), v.end()); v.erase(unique(v.begin(), v.end()), v.end()); }
void add(int& x, int y) { x += y; if (x >= MOD) x -= MOD; }
struct fast_ios {
  fast_ios() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
  };
} fast_ios_;
const int N = 2e5 + 10;
int f[N], c[N];
int find(int x) {
  if (f[x] != f[f[x]]) f[x] = find(f[x]);
  return f[x];
}
void join(int x, int y) {
  int rx = find(x), ry = find(y);
  if (rx != ry) {
    f[ry] = rx;
    c[rx] += c[ry];
  }
}
int main() {
  for (int i = 0; i < N; ++i) f[i] = i, c[i] = 1;
  int n;
  cin >> n;
  map<int, int> deg;
  for (int i = 0; i < n; ++i) {
    int x, y;
    cin >> x >> y;
    deg[x]++;
    deg[y]--;
    join(x, y);
  }
  bool ok = true;
  for (int i = 0; i < N; ++i) {
    if (deg.find(i) == deg.end()) continue;
    if (c[find(i)] != SZ(deg)) {
      ok = false;
      break;
    }
  }
  int pos_cnt = 0, neg_cnt = 0;
  for (auto& [k, v] : deg) {
    if (abs(v) > 1) {
      ok = false;
      break;
    }
    if (v > 0) pos_cnt++;
    if (v < 0) neg_cnt++;
  }
  if (pos_cnt > 1 || neg_cnt > 1 || pos_cnt != neg_cnt) ok = false;
  if (!ok) {
    cout << 0 << '\n';
    return 0;
  }
  if (pos_cnt == 1) {
    cout << 1 << '\n';
  } else {
    cout << SZ(deg) << '\n';
  }
  return 0;
}
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