結果

問題 No.1244 Black Segment
ユーザー packer_jppacker_jp
提出日時 2020-10-02 23:11:27
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 170 ms / 2,000 ms
コード長 4,764 bytes
コンパイル時間 2,137 ms
コンパイル使用メモリ 205,560 KB
最終ジャッジ日時 2025-01-15 01:13:26
ジャッジサーバーID
(参考情報)
judge5 / 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 * 36
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

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i, n) for (int i = 0; i < (int) (n); i++)
#define reps(i, n) for (int i = 1; i <= (int) (n); i++)
#define all(a) (a).begin(), (a).end()
#define uniq(a) (a).erase(unique(all(a)), (a).end())
#define bit(n) (1LL << (n))
#define dump(a) cerr << #a " = " << (a) << endl
using vint = vector<int>;
using pint = pair<int, int>;
using vpint = vector<pint>;
template<typename T> using priority_queue_rev = priority_queue<T, vector<T>, greater<T>>;
constexpr double PI = 3.1415926535897932384626433832795028;
constexpr int DY[9] = {0, 1, 0, -1, 1, 1, -1, -1, 0};
constexpr int DX[9] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
int sign(int a) { return (a > 0) - (a < 0); }
int gcd(int a, int b) {
while (b) { swap(a %= b, b); }
return a;
}
int lcm(int a, int b) { return a / gcd(a, b) * b; }
int cdiv(int a, int b) { return (a - 1 + b) / b; }
template<typename T> void fin(T a) {
cout << a << endl;
exit(0);
}
template<typename T> T sq(T a) { return a * a; }
template<typename T, typename U> bool chmax(T &a, const U &b) {
if (a < b) {
a = b;
return true;
}
return false;
}
template<typename T, typename U> bool chmin(T &a, const U &b) {
if (b < a) {
a = b;
return true;
}
return false;
}
template<typename T, typename U> ostream &operator<<(ostream &os, const pair<T, U> &a) {
os << "(" << a.first << ", " << a.second << ")";
return os;
}
template<typename T> ostream &operator<<(ostream &os, const vector<T> &a) {
os << "{";
for (auto itr = a.begin(); itr != a.end(); itr++) {
os << *itr << (next(itr) != a.end() ? ", " : "");
}
os << "}";
return os;
}
template<typename T> ostream &operator<<(ostream &os, const deque<T> &a) {
os << "{";
for (auto itr = a.begin(); itr != a.end(); itr++) {
os << *itr << (next(itr) != a.end() ? ", " : "");
}
os << "}";
return os;
}
template<typename T> ostream &operator<<(ostream &os, const set<T> &a) {
os << "{";
for (auto itr = a.begin(); itr != a.end(); itr++) {
os << *itr << (next(itr) != a.end() ? ", " : "");
}
os << "}";
return os;
}
template<typename T> ostream &operator<<(ostream &os, const multiset<T> &a) {
os << "{";
for (auto itr = a.begin(); itr != a.end(); itr++) {
os << *itr << (next(itr) != a.end() ? ", " : "");
}
os << "}";
return os;
}
template<typename T, typename U> ostream &operator<<(ostream &os, const map<T, U> &a) {
os << "{";
for (auto itr = a.begin(); itr != a.end(); itr++) {
os << *itr << (next(itr) != a.end() ? ", " : "");
}
os << "}";
return os;
}
struct setup {
static constexpr int PREC = 20;
setup() {
cout << fixed << setprecision(PREC);
cerr << fixed << setprecision(PREC);
};
} setup;
template<typename S>
struct dijkstra {
using T = typename S::T;
using E = typename S::E;
std::vector<std::vector<int>> adj;
std::vector<std::vector<E>> cost;
dijkstra(int n) : adj(n), cost(n) {}
void add_edge(int from, int to, E cost) { adj[from].emplace_back(to), this->cost[from].emplace_back(cost); }
std::vector<T> get_dist(int s) {
std::vector<T> ret(adj.size(), S::inf());
using P = std::pair<T, int>;
auto c = [&](P a, P b) -> bool { return S::less(b.first, a.first); };
std::priority_queue<P, std::vector<P>, decltype(c)> pq(c);
ret[s] = S::zero();
pq.emplace(ret[s], s);
while (!pq.empty()) {
P p = pq.top();
pq.pop();
int v = p.second;
if (S::less(ret[v], p.first)) { continue; }
for (int i = 0; i < adj[v].size(); i++) {
int u = adj[v][i];
T dist = S::plus(ret[v], cost[v][i]);
if (S::less(dist, ret[u])) { ret[u] = dist, pq.emplace(ret[u], u); }
}
}
return ret;
}
};
struct int_dij {
using T = int;
using E = int;
static T zero() { return 0; }
static T inf() { return std::numeric_limits<T>::max(); }
static T plus(const T &a, const E &b) { return a == inf() ? inf() : a + b; }
static bool less(const T &a, const T &b) { return a < b; }
};
signed main() {
int N, M, A, B;
cin >> N >> M >> A >> B;
dijkstra<int_dij> dij(N + 3);
int s = N + 1, t = N + 2;
rep(i, A) { dij.add_edge(s, i, 0); }
for (int i = B; i <= N; i++) { dij.add_edge(i, t, 0); }
rep(i, M) {
int L, R;
cin >> L >> R, L--;
dij.add_edge(L, R, 1);
dij.add_edge(R, L, 1);
}
int ans = dij.get_dist(s)[t];
if (ans == int_dij::inf()) { cout << -1 << endl; }
else { cout << ans << endl; }
}
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