結果
| 問題 |
No.1265 Balloon Survival
|
| コンテスト | |
| ユーザー |
tenten
|
| 提出日時 | 2024-02-07 08:34:09 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 718 ms / 2,000 ms |
| コード長 | 2,896 bytes |
| コンパイル時間 | 2,857 ms |
| コンパイル使用メモリ | 87,488 KB |
| 実行使用メモリ | 80,504 KB |
| 最終ジャッジ日時 | 2024-09-28 12:23:00 |
| 合計ジャッジ時間 | 15,404 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 32 |
ソースコード
import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;
public class Main {
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner();
int n = sc.nextInt();
List<Point> points = IntStream.range(0, n).mapToObj(i -> new Point(i, sc.nextInt(), sc.nextInt())).toList();
boolean[] broken = new boolean[n];
int[] ans = {0};
points.stream().flatMap(x -> {
return points.stream().filter(y -> x.idx < y.idx)
.map(y -> new Distance(x, y));
}).sorted()
.forEach(z -> {
if (z.left == 0) {
if (!broken[z.right]) {
ans[0]++;
broken[z.right] = true;
}
} else if (!broken[z.left] && !broken[z.right]) {
broken[z.left] = true;
broken[z.right] = true;
}
});
System.out.println(ans[0]);
}
static class Point {
int idx;
long x;
long y;
public Point(int idx, long x, long y) {
this.idx = idx;
this.x = x;
this.y = y;
}
public long getDistance(Point p) {
return (x - p.x) * (x - p.x) + (y - p.y) * (y - p.y);
}
}
static class Distance implements Comparable<Distance> {
int left;
int right;
long value;
public Distance(int left, int right, long value) {
this.left = left;
this.right = right;
this.value = value;
}
public Distance(Point p1, Point p2) {
this(p1.idx, p2.idx, p1.getDistance(p2));
}
public int compareTo(Distance another) {
return Long.compare(value, another.value);
}
public String toString() {
return left + ":" + right + ":" + value;
}
}
}
class Scanner {
BufferedReader br;
StringTokenizer st = new StringTokenizer("");
StringBuilder sb = new StringBuilder();
public Scanner() {
try {
br = new BufferedReader(new InputStreamReader(System.in));
} catch (Exception e) {
}
}
public int nextInt() {
return Integer.parseInt(next());
}
public long nextLong() {
return Long.parseLong(next());
}
public double nextDouble() {
return Double.parseDouble(next());
}
public String next() {
try {
while (!st.hasMoreTokens()) {
st = new StringTokenizer(br.readLine());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
return st.nextToken();
}
}
}
tenten