結果
問題 | No.860 買い物 |
ユーザー |
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提出日時 | 2023-01-31 16:41:46 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 657 ms / 1,000 ms |
コード長 | 3,370 bytes |
コンパイル時間 | 2,773 ms |
コンパイル使用メモリ | 85,732 KB |
実行使用メモリ | 71,824 KB |
最終ジャッジ日時 | 2024-06-30 19:03:36 |
合計ジャッジ時間 | 10,952 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 15 |
ソースコード
import java.io.*;import java.util.*;import java.util.stream.*;public class Main {public static void main(String[] args) throws Exception {Scanner sc = new Scanner();int n = sc.nextInt();ArrayList<Bridge> list = new ArrayList<>();long total = 0;for (int i = 0; i < n; i++) {int c = sc.nextInt();int d = sc.nextInt();list.add(new Bridge(i, n, c));total += c;if (i > 0) {list.add(new Bridge(i - 1, i, d));}}Collections.sort(list);UnionFindTree uft = new UnionFindTree(n + 1);for (Bridge x : list) {if (!uft.same(x)) {uft.unite(x);total += x.value;}}System.out.println(total);}static class UnionFindTree {int[] parents;public UnionFindTree(int size) {parents = new int[size];for (int i = 0; i < size; i++) {parents[i] = i;}}public int find(int x) {if (parents[x] == x) {return x;} else {return parents[x] = find(parents[x]);}}public boolean same(int x, int y) {return find(x) == find(y);}public boolean same(Bridge b) {return same(b.left, b.right);}public void unite(int x, int y) {if (!same(x, y)) {parents[find(x)] = find(y);}}public void unite(Bridge b) {unite(b.left, b.right);}}static class Bridge implements Comparable<Bridge> {int left;int right;int value;public Bridge(int left, int right, int value) {this.left = left;this.right = right;this.value = value;}public int compareTo(Bridge another) {return value - another.value;}}}class Utilities {static String arrayToLineString(Object[] arr) {return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));}static String arrayToLineString(int[] arr) {return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));}}class Scanner {BufferedReader br = new BufferedReader(new InputStreamReader(System.in));StringTokenizer st = new StringTokenizer("");StringBuilder sb = new StringBuilder();public Scanner() throws Exception {}public int nextInt() throws Exception {return Integer.parseInt(next());}public long nextLong() throws Exception {return Long.parseLong(next());}public double nextDouble() throws Exception {return Double.parseDouble(next());}public int[] nextIntArray() throws Exception {return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();}public String next() throws Exception {while (!st.hasMoreTokens()) {st = new StringTokenizer(br.readLine());}return st.nextToken();}}