結果
問題 | No.860 買い物 |
ユーザー | tenten |
提出日時 | 2023-01-31 16:41:46 |
言語 | Java21 (openjdk 21) |
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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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 | 55 ms
50,156 KB |
testcase_01 | AC | 55 ms
50,564 KB |
testcase_02 | AC | 54 ms
50,192 KB |
testcase_03 | AC | 55 ms
50,552 KB |
testcase_04 | AC | 58 ms
50,536 KB |
testcase_05 | AC | 58 ms
50,224 KB |
testcase_06 | AC | 149 ms
52,996 KB |
testcase_07 | AC | 646 ms
65,524 KB |
testcase_08 | AC | 633 ms
65,800 KB |
testcase_09 | AC | 656 ms
65,244 KB |
testcase_10 | AC | 657 ms
65,816 KB |
testcase_11 | AC | 383 ms
65,684 KB |
testcase_12 | AC | 385 ms
71,824 KB |
testcase_13 | AC | 603 ms
65,976 KB |
testcase_14 | AC | 622 ms
66,116 KB |
testcase_15 | AC | 368 ms
65,848 KB |
testcase_16 | AC | 630 ms
64,332 KB |
testcase_17 | AC | 373 ms
63,348 KB |
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(); } }