結果

問題 No.439 チワワのなる木
ユーザー GrenacheGrenache
提出日時 2017-09-17 13:02:20
言語 Java21
(openjdk 21)
結果
AC  
実行時間 448 ms / 5,000 ms
コード長 5,187 bytes
コンパイル時間 3,810 ms
コンパイル使用メモリ 77,064 KB
実行使用メモリ 77,316 KB
最終ジャッジ日時 2023-08-07 20:29:11
合計ジャッジ時間 9,774 ms
ジャッジサーバーID
（参考情報） 		judge12 / judge15
このコードへのチャレンジ（β）

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 43 ms
49,216 KB
testcase_01 AC 43 ms
49,444 KB
testcase_02 AC 43 ms
49,360 KB
testcase_03 AC 44 ms
49,372 KB
testcase_04 AC 44 ms
49,232 KB
testcase_05 AC 44 ms
49,536 KB
testcase_06 AC 43 ms
49,524 KB
testcase_07 AC 43 ms
49,412 KB
testcase_08 AC 44 ms
49,488 KB
testcase_09 AC 44 ms
49,404 KB
testcase_10 AC 45 ms
49,396 KB
testcase_11 AC 43 ms
49,704 KB
testcase_12 AC 43 ms
49,436 KB
testcase_13 AC 51 ms
49,384 KB
testcase_14 AC 54 ms
48,804 KB
testcase_15 AC 68 ms
51,360 KB
testcase_16 AC 82 ms
51,868 KB
testcase_17 AC 73 ms
51,384 KB
testcase_18 AC 336 ms
67,436 KB
testcase_19 AC 317 ms
66,736 KB
testcase_20 AC 391 ms
72,644 KB
testcase_21 AC 188 ms
57,796 KB
testcase_22 AC 179 ms
58,108 KB
testcase_23 AC 448 ms
74,828 KB
testcase_24 AC 423 ms
77,140 KB
testcase_25 AC 395 ms
75,704 KB
testcase_26 AC 357 ms
77,128 KB
testcase_27 AC 320 ms
77,316 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

import java.io.*;
import java.util.*;


public class Main_yukicoder439 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int n = sc.nextInt();
		char[] s = sc.next().toCharArray();

		List<List<Integer>> edges = new ArrayList<>(n);
		for (int i = 0; i < n; i++) {
			edges.add(new ArrayList<>());
		}
		for (int i = 0; i < n - 1; i++) {
			int a = sc.nextInt() - 1;
			int b = sc.nextInt() - 1;
			edges.get(a).add(b);
			edges.get(b).add(a);
		}

		boolean[] used = new boolean[n];
		int[] p = new int[n];
		int[] cc = new int[n];
		int[] cw = new int[n];
		Arrays.fill(p, -1);
		int root = 0;
		p[root] = root;

		Deque<Integer> st = new ArrayDeque<>();
		st.push(root);
		while (!st.isEmpty()) {
			int e = st.peek();

			if (used[e]) {
				st.pop();
				if (s[e] == 'c') {
					cc[e]++;
				} else {
					cw[e]++;
				}
				if (e != p[e]) {
					cc[p[e]] += cc[e];
					cw[p[e]] += cw[e];
				}
			} else {
				used[e] = true;
				for (int next : edges.get(e)) {
					if (p[next] != -1) {
						continue;
					}

					st.push(next);
					p[next] = e;
				}
			}
		}

		int tc = cc[root];
		int tw = cw[root];

		long ans = 0;
		for (int i = 0; i < n; i++) {
			if (s[i] == 'w') {
				int pc = tc - cc[i];
//				int pw = tw - cw[i];

				for (int next : edges.get(i)) {
					if (next == p[i]) {
						ans += (long)pc * (cw[i] - 1);
					} else {
						ans += (long)cc[next] * (tw - cw[next] - 1);
					}
				}
			}
		}

		pr.println(ans);
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	@SuppressWarnings("unused")
	private static class Scanner {
		BufferedReader br;

		Scanner (InputStream in) {
			br = new BufferedReader(new InputStreamReader(in));
		}

		private boolean isPrintable(int ch) {
			return ch >= '!' && ch <= '~';
		}

		private boolean isCRLF(int ch) {
			return ch == '\n' || ch == '\r' || ch == -1;
		}

		private int nextPrintable() {
			try {
				int ch;
				while (!isPrintable(ch = br.read())) {
					if (ch == -1) {
						throw new NoSuchElementException();
					}
				}

				return ch;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		String next() {
			try {
				int ch = nextPrintable();
				StringBuilder sb = new StringBuilder();
				do {
					sb.appendCodePoint(ch);
				} while (isPrintable(ch = br.read()));

				return sb.toString();
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		int nextInt() {
			try {
				// parseInt from Integer.parseInt()
				boolean negative = false;
				int res = 0;
				int limit = -Integer.MAX_VALUE;
				int radix = 10;

				int fc = nextPrintable();
				if (fc < '0') {
					if (fc == '-') {
						negative = true;
						limit = Integer.MIN_VALUE;
					} else if (fc != '+') {
						throw new NumberFormatException();
					}
					fc = br.read();
				}
				int multmin = limit / radix;

				int ch = fc;
				do {
					int digit = ch - '0';
					if (digit < 0 || digit >= radix) {
						throw new NumberFormatException();
					}
					if (res < multmin) {
						throw new NumberFormatException();
					}
					res *= radix;
					if (res < limit + digit) {
						throw new NumberFormatException();
					}
					res -= digit;

				} while (isPrintable(ch = br.read()));

				return negative ? res : -res;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		long nextLong() {
			try {
				// parseLong from Long.parseLong()
				boolean negative = false;
				long res = 0;
				long limit = -Long.MAX_VALUE;
				int radix = 10;

				int fc = nextPrintable();
				if (fc < '0') {
					if (fc == '-') {
						negative = true;
						limit = Long.MIN_VALUE;
					} else if (fc != '+') {
						throw new NumberFormatException();
					}
					fc = br.read();
				}
				long multmin = limit / radix;

				int ch = fc;
				do {
					int digit = ch - '0';
					if (digit < 0 || digit >= radix) {
						throw new NumberFormatException();
					}
					if (res < multmin) {
						throw new NumberFormatException();
					}
					res *= radix;
					if (res < limit + digit) {
						throw new NumberFormatException();
					}
					res -= digit;

				} while (isPrintable(ch = br.read()));

				return negative ? res : -res;
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		float nextFloat() {
			return Float.parseFloat(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			try {
				int ch;
				while (isCRLF(ch = br.read())) {
					if (ch == -1) {
						throw new NoSuchElementException();
					}
				}
				StringBuilder sb = new StringBuilder();
				do {
					sb.appendCodePoint(ch);
				} while (!isCRLF(ch = br.read()));

				return sb.toString();
			} catch (IOException e) {
				throw new NoSuchElementException();
			}
		}

		void close() {
			try {
				br.close();
			} catch (IOException e) {
//				throw new NoSuchElementException();
			}
		}
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}
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