結果
| 問題 |
No.2376 障害物競プロ
|
| コンテスト | |
| ユーザー |
Forested
|
| 提出日時 | 2023-07-07 21:58:55 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 447 ms / 4,000 ms |
| コード長 | 3,837 bytes |
| コンパイル時間 | 1,155 ms |
| コンパイル使用メモリ | 132,756 KB |
| 最終ジャッジ日時 | 2025-02-15 07:20:33 |
|
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 40 |
ソースコード
#ifndef LOCAL
#define FAST_IO
#endif
// ============
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define OVERRIDE(a, b, c, d, ...) d
#define REP2(i, n) for (i32 i = 0; i < (i32)(n); ++i)
#define REP3(i, m, n) for (i32 i = (i32)(m); i < (i32)(n); ++i)
#define REP(...) OVERRIDE(__VA_ARGS__, REP3, REP2)(__VA_ARGS__)
#define PER(i, n) for (i32 i = (i32)(n) - 1; i >= 0; --i)
#define ALL(x) begin(x), end(x)
using namespace std;
using u32 = unsigned int;
using u64 = unsigned long long;
using i32 = signed int;
using i64 = signed long long;
using f64 = double;
using f80 = long double;
template <typename T>
using Vec = vector<T>;
template <typename T>
bool chmin(T &x, const T &y) {
if (x > y) {
x = y;
return true;
}
return false;
}
template <typename T>
bool chmax(T &x, const T &y) {
if (x < y) {
x = y;
return true;
}
return false;
}
#ifdef INT128
using u128 = __uint128_t;
using i128 = __int128_t;
istream &operator>>(istream &is, i128 &x) {
i64 v;
is >> v;
x = v;
return is;
}
ostream &operator<<(ostream &os, i128 x) {
os << (i64)x;
return os;
}
istream &operator>>(istream &is, u128 &x) {
u64 v;
is >> v;
x = v;
return is;
}
ostream &operator<<(ostream &os, u128 x) {
os << (u64)x;
return os;
}
#endif
[[maybe_unused]] constexpr i32 INF = 1000000100;
[[maybe_unused]] constexpr i64 INF64 = 3000000000000000100;
struct SetUpIO {
SetUpIO() {
#ifdef FAST_IO
ios::sync_with_stdio(false);
cin.tie(nullptr);
#endif
cout << fixed << setprecision(15);
}
} set_up_io;
// ============
#ifdef DEBUGF
#else
#define DBG(x) (void)0
#endif
struct Point {
i64 x, y;
};
f64 dist(Point p, Point q) {
i64 dx = p.x - q.x, dy = p.y - q.y;
return sqrt(dx * dx + dy * dy);
}
using Segment = pair<Point, Point>;
tuple<i64, i64, i64> into_eq(Segment s) {
i64 dx = s.second.x - s.first.x, dy = s.second.y - s.first.y;
i64 a = dy, b = -dx;
i64 c = -(a * s.first.x + b * s.first.y);
return make_tuple(a, b, c);
}
i64 sgn(i64 x) {
return x < 0 ? -1 : x > 0 ? 1 : 0;
}
bool cross(Segment s1, Segment s2) {
REP(iter, 2) {
auto [a, b, c] = into_eq(s1);
i64 pc = a * s2.first.x + b * s2.first.y + c;
i64 t = a * s2.second.x + b * s2.second.y + c;
if (sgn(pc) * sgn(t) >= 0) {
return false;
}
swap(s1, s2);
}
return true;
}
int main() {
i32 n, m;
cin >> n >> m;
Vec<Segment> segs(n);
REP(i, n) {
cin >> segs[i].first.x >> segs[i].first.y;
cin >> segs[i].second.x >> segs[i].second.y;
}
Vec<Vec<f64>> di(2 * n, Vec<f64>(2 * n, 1e20));
REP(i, 2 * n) {
di[i][i] = 0.;
}
REP(i, n) REP(u, 2) REP(j, n) REP(v, 2) {
Point from = (u ? segs[i].second : segs[i].first);
Point to = (v ? segs[j].second : segs[j].first);
Segment seg{from, to};
bool ok = true;
REP(k, n) {
if (k != i && k != j && cross(seg, segs[k])) {
ok = false;
break;
}
}
if (ok) {
di[2 * i + u][2 * j + v] = dist(from, to);
}
}
DBG(di);
REP(k, 2 * n) REP(i, 2 * n) REP(j, 2 * n) {
chmin(di[i][j], di[i][k] + di[k][j]);
}
REP(qi, m) {
i32 a, b, c, d;
cin >> a >> b >> c >> d;
--a;
--b;
--c;
--d;
cout << di[2 * a + b][2 * c + d] << '\n';
}
}
Forested