結果
問題 | No.168 ものさし |
ユーザー | kenkoooo |
提出日時 | 2015-03-20 00:45:48 |
言語 | Java21 (openjdk 21) |
結果 |
WA
|
実行時間 | - |
コード長 | 3,226 bytes |
コンパイル時間 | 2,746 ms |
コンパイル使用メモリ | 81,072 KB |
実行使用メモリ | 72,632 KB |
最終ジャッジ日時 | 2024-06-28 23:37:03 |
合計ジャッジ時間 | 8,090 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
(要ログイン)
テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 207 ms
47,980 KB |
testcase_01 | AC | 49 ms
37,108 KB |
testcase_02 | AC | 48 ms
37,140 KB |
testcase_03 | WA | - |
testcase_04 | WA | - |
testcase_05 | AC | 49 ms
37,064 KB |
testcase_06 | WA | - |
testcase_07 | WA | - |
testcase_08 | AC | 48 ms
36,780 KB |
testcase_09 | WA | - |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | AC | 434 ms
62,436 KB |
testcase_14 | WA | - |
testcase_15 | WA | - |
testcase_16 | WA | - |
testcase_17 | WA | - |
testcase_18 | WA | - |
testcase_19 | WA | - |
testcase_20 | WA | - |
testcase_21 | WA | - |
testcase_22 | AC | 439 ms
62,828 KB |
ソースコード
import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; public class Main { public static void main(String[] args) { int N = nextInt(); int[] x = new int[N]; int[] y = new int[N]; for (int i = 0; i < N; i++) { x[i] = nextInt(); y[i] = nextInt(); } Kruscal g = new Kruscal(N); for (int i = 0; i < N; i++) { for (int j = 0; j < i; j++) { long dx = x[i] - x[j]; long dy = y[i] - y[j]; long distSq = dx * dx + dy * dy; long d = (long) Math.sqrt(distSq); while (distSq > d * d) { d += 10; } // long d = (sqrtCeil(distSq) + 9) / 10 * 10; g.addBidirectionalEdge(i, j, (int) d); } } System.out.println(g.minCost()); } static long sqrtCeil(long n) { long l = 0; long r = 2000000000; while (l + 1 < r) { // (l+r)/2を超えない整数 long c = (l + r) >>> 1; if (c * c >= n) { r = c; } else { l = c; } } return r; } static int nextInt() { int c; try { c = System.in.read(); while (c != '-' && (c < '0' || c > '9')) c = System.in.read(); if (c == '-') return -nextInt(); int res = 0; while (c >= '0' && c <= '9') { res = res * 10 + c - '0'; c = System.in.read(); } return res; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return -1; } } class Kruscal { int n; ArrayList<Edge> graph = new ArrayList<Edge>(); public Kruscal(int n) { this.n = n; } public void addBidirectionalEdge(int u, int v, int cost) { // System.out.println(u + "," + v + "," + cost); graph.add(new Edge(cost, u, v)); } public int minCost() { Collections.sort(graph); // System.out.println(graph); UnionFind uf = new UnionFind(n); int ans = 0; int connected = 1; for (int i = 0; i < graph.size(); i++) { Edge e = graph.get(i); if (!uf.isConnected(e.from, e.to)) { uf.union(e.from, e.to); connected++; ans = Math.max(ans, e.cost); if (connected == n) { break; } } if (uf.isConnected(0, n - 1)) { return ans; } } return ans; } static class Edge implements Comparable<Edge> { int cost; int from; int to; public Edge(int cost, int from, int to) { this.cost = cost; this.from = from; this.to = to; } @Override public int compareTo(Edge o) { if (this.cost == o.cost) { return 0; } else if (this.cost > o.cost) { return 1; } else { return -1; } } public String toString() { return this.cost + "," + this.from + "," + this.to; } } static class UnionFind { private int[] data; public UnionFind(int size) { data = new int[size]; Arrays.fill(data, -1); } public void union(int x, int y) { x = root(x); y = root(y); if (x != y) { if (data[y] < data[x]) { int tmp = y; y = x; x = tmp; } data[x] += data[y]; data[y] = x; } } public boolean isConnected(int x, int y) { return root(x) == root(y); } private int root(int x) { return data[x] < 0 ? x : (data[x] = root(data[x])); } public int size(int x) { return -data[root(x)]; } public String toString() { return Arrays.toString(data); } } }