結果
問題 | No.96 圏外です。 |
ユーザー |
|
提出日時 | 2018-04-12 16:56:28 |
言語 | D (dmd 2.109.1) |
結果 |
AC
|
実行時間 | 1,334 ms / 5,000 ms |
コード長 | 3,183 bytes |
コンパイル時間 | 2,774 ms |
コンパイル使用メモリ | 184,652 KB |
実行使用メモリ | 38,072 KB |
最終ジャッジ日時 | 2024-06-13 00:24:06 |
合計ジャッジ時間 | 13,992 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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ファイルパターン | 結果 |
---|---|
other | AC * 28 |
ソースコード
import std.stdio, std.array, std.string, std.conv, std.algorithm;import std.typecons, std.range, std.random, std.math, std.container;import std.numeric, std.bigint, core.bitop;void main() {auto N = readln.chomp.to!int;auto P = N.iota.map!(_ => readln.split.map!(to!int)).map!(a => Point(a[0], a[1])).array;if (N == 0) {writeln(1);return;}Tuple!(int, int)[][int] X;foreach (i, p; P.enumerate) {X[p.x] ~= tuple(p.y, i.to!int);}foreach (k; X.keys) X[k].sort();auto uf = new UnionFind(N);foreach (i, p; P.enumerate) {foreach (dx; -10..11) {int nx = p.x + dx;if (nx !in X) continue;int j = X[nx].assumeSorted.lowerBound(tuple(p.y, 0)).length.to!int;for (int k = j; k < X[nx].length; ++k) {int ny = X[nx][k][0];if (dx * dx + (ny - p.y) * (ny - p.y) > 100) break;if (nx != p.x || ny != p.y) uf.unite(i.to!int, X[nx][k][1]);}for (int k = min(j, X[nx].length.to!int-1); k >= 0; --k) {int ny = X[nx][k][0];if (dx * dx + (ny - p.y) * (ny - p.y) > 100) break;if (nx != p.x || ny != p.y) uf.unite(i.to!int, X[nx][k][1]);}}}int farest = 0;foreach (i; 0..N) {if (uf.groups[i].empty) continue;auto ch = convex_hull(uf.groups[i].map!(i => P[i]).array);foreach (j; 0..ch.length) {foreach (k; j+1..ch.length) {farest = max(farest, dist2(ch[j], ch[k]));}}}writefln("%.9f", sqrt(farest * 1.0L) + 2);}struct Point {int x;int y;}Point[] convex_hull(Point[] points) {int N = points.length.to!int;points.sort!((a, b) => a.x == b.x ? a.y < b.y : a.x < b.x);Point[] ch1, ch2;foreach (i; 0..N) {while (ch1.length >= 2 && rot(ch1[$-2], ch1[$-1], points[i]) <= 0) ch1.popBack;ch1 ~= points[i];}foreach_reverse (i; 0..N) {while (ch2.length >= 2 && rot(ch2[$-2], ch2[$-1], points[i]) <= 0) ch2.popBack;ch2 ~= points[i];}auto ch = ch1 ~ ch2;return ch.sort!((a, b) => a.x == b.x ? a.y < b.y : a.x < b.x).uniq.array;}int rot(Point a, Point b, Point c) {// a -> b -> c の向き// 正なら左、負なら右、0なら同一直線状return (b.x - a.x) * (c.y - a.y) - (b.y - a.y) * (c.x - a.x);}int dist2(Point a, Point b) {return (a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y);}class UnionFind {int N;int[] table;int[][] groups;this(int n) {N = n;table = new int[](N);fill(table, -1);groups = new int[][](N);foreach (i; 0..N) groups[i] = [i];}int find(int x) {return table[x] < 0 ? x : (table[x] = find(table[x]));}void unite(int x, int y) {x = find(x);y = find(y);if (x == y) return;if (table[x] > table[y]) swap(x, y);table[x] += table[y];table[y] = x;groups[x] ~= groups[y];groups[y] = [];}}