結果
| 問題 |
No.1065 電柱 / Pole (Easy)
|
| コンテスト | |
| ユーザー |
kcvlex
|
| 提出日時 | 2020-05-30 02:27:36 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 254 ms / 2,000 ms |
| コード長 | 4,987 bytes |
| コンパイル時間 | 1,446 ms |
| コンパイル使用メモリ | 165,656 KB |
| 最終ジャッジ日時 | 2025-01-10 19:04:49 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 46 |
ソースコード
#define CPP17
#include <limits>
#include <initializer_list>
#include <utility>
#include <bitset>
#include <tuple>
#include <type_traits>
#include <functional>
#include <string>
#include <array>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <iterator>
#include <algorithm>
#include <complex>
#include <random>
#include <numeric>
#include <iostream>
#include <iomanip>
#include <sstream>
#include <regex>
#include <cassert>
#include <cstddef>
#ifdef CPP17
#include <variant>
#endif
// Yay!!
#define endl codeforces
// macros for iterator
#define ALL(v) std::begin(v), std::end(v)
#define ALLR(v) std::rbegin(v), std::rend(v)
// alias
using ll = std::int64_t;
using ull = std::uint64_t;
using pii = std::pair<int, int>;
using tii = std::tuple<int, int, int>;
using pll = std::pair<ll, ll>;
using tll = std::tuple<ll, ll, ll>;
template <typename T> using vec = std::vector<T>;
template <typename T> using vvec = vec<vec<T>>;
// variadic min/max
template <typename T> const T& var_min(const T &t) { return t; }
template <typename T> const T& var_max(const T &t) { return t; }
template <typename T, typename... Tail> const T& var_min(const T &t, const Tail&... tail) { return std::min(t, var_min(tail...)); }
template <typename T, typename... Tail> const T& var_max(const T &t, const Tail&... tail) { return std::max(t, var_max(tail...)); }
// variadic chmin/chmax
template <typename T, typename... Tail> void chmin(T &t, const Tail&... tail) { t = var_min(t, tail...); }
template <typename T, typename... Tail> void chmax(T &t, const Tail&... tail) { t = var_max(t, tail...); }
// multi demension array
template <typename T, std::size_t Head, std::size_t... Tail> struct multi_dim_array { using type = std::array<typename multi_dim_array<T, Tail...>::type, Head>; };
template <typename T, std::size_t Head> struct multi_dim_array<T, Head> { using type = std::array<T, Head>; };
template <typename T, std::size_t... Args> using mdarray = typename multi_dim_array<T, Args...>::type;
#ifdef CPP17
// fill container
template <typename T, typename F, typename... Args>
void fill_seq(T &t, F f, Args... args) { if constexpr (std::is_invocable<F, Args...>::value) { t = f(args...); } else { for (ssize_t i = 0; i < t.size(); i++) fill_seq(t[i], f, args..., i); } }
#endif
// make multi dimension vector
template <typename T> vec<T> make_v(ssize_t sz) { return vec<T>(sz); }
template <typename T, typename... Tail> auto make_v(ssize_t hs, Tail&&... ts) { auto v = std::move(make_v<T>(std::forward<Tail>(ts)...)); return vec<decltype(v)>(hs, v); }
// init
namespace init__ {
struct InitIO { InitIO() { std::cin.tie(nullptr); std::ios_base::sync_with_stdio(false); std::cout << std::fixed << std::setprecision(30); } } init_io;
}
namespace tree {
struct UnionFind {
vec<ll> rank, par;
vec<ssize_t> sz;
UnionFind(ll n) : rank(n), par(n), sz(n) {
init();
}
void init() {
std::fill(ALL(rank), 1);
std::iota(ALL(par), 0);
std::fill(ALL(sz), 1);
}
ll find(ll n) {
return (n == par[n] ? n : par[n] = find(par[n]));
}
bool unit(ll x, ll y) {
ll px = find(x), py = find(y);
if (px == py) return false;
if (rank[px] < rank[py]) std::swap(px, py);
par[py] = px;
rank[px] += (rank[px] == rank[py]);
sz[px] += sz[py];
return true;
}
bool same(ll x, ll y) {
return find(x) == find(y);
}
ssize_t size(ll n) {
return sz[find(n)];
}
};
}
int main() {
using ld = long double;
using pdd = std::pair<ld, ld>;
using pld = std::pair<ll, ld>;
using pdl = std::pair<ld, ll>;
ll n, m, x, y;
std::cin >> n >> m;
std::cin >> x >> y;
x--; y--;
vec<pdd> vn(n);
for (auto &&e : vn) {
ld a, b;
std::cin >> a >> b;
e = pll(a, b);
}
auto pow2 = [](ld a) { return a * a; };
auto dist = [&](pdd p, pdd q) {
auto [ a, b ] = p;
auto [ c, d ] = q;
return std::sqrt(pow2(a - c) + pow2(b - d));
};
vvec<pld> edges(n);
for (ll i = 0; i < m; i++) {
ll a, b;
std::cin >> a >> b;
a--; b--;
auto d = dist(vn[a], vn[b]);
edges[a].emplace_back(b, d);
edges[b].emplace_back(a, d);
}
const ld inf = std::numeric_limits<ld>::max() / 3;
vec<ld> dists(n, inf);
dists[x] = 0;
std::priority_queue<pdl, vec<pdl>, std::greater<pdl>> pq;
pq.emplace(0, x);
while (pq.size()) {
auto [ d, cur ] = pq.top();
pq.pop();
if (dists[cur] < d) continue;
for (auto &&e : edges[cur]) {
auto [ nxt, cost ] = e;
auto nd = d + cost;
if (dists[nxt] <= nd) continue;
dists[nxt] = nd;
pq.emplace(nd, nxt);
}
}
std::cout << dists[y] << "\n";
return 0;
}
kcvlex