結果

問題 No.454 逆2乗和
ユーザー hiromi_ayasehiromi_ayase
提出日時 2016-12-26 15:31:45
言語 Java19
(openjdk 21)
結果
AC  
実行時間 168 ms / 2,000 ms
コード長 2,940 bytes
コンパイル時間 4,292 ms
コンパイル使用メモリ 73,836 KB
実行使用メモリ 55,960 KB
最終ジャッジ日時 2023-08-20 03:33:43
合計ジャッジ時間 10,102 ms
ジャッジサーバーID
(参考情報)
judge14 / judge13
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 167 ms
55,960 KB
testcase_01 AC 165 ms
55,544 KB
testcase_02 AC 167 ms
55,588 KB
testcase_03 AC 167 ms
55,532 KB
testcase_04 AC 167 ms
55,288 KB
testcase_05 AC 165 ms
55,644 KB
testcase_06 AC 165 ms
55,676 KB
testcase_07 AC 165 ms
55,692 KB
testcase_08 AC 164 ms
55,588 KB
testcase_09 AC 164 ms
55,664 KB
testcase_10 AC 164 ms
55,652 KB
testcase_11 AC 164 ms
55,712 KB
testcase_12 AC 163 ms
55,552 KB
testcase_13 AC 165 ms
55,564 KB
testcase_14 AC 166 ms
53,744 KB
testcase_15 AC 168 ms
55,208 KB
testcase_16 AC 165 ms
55,320 KB
testcase_17 AC 165 ms
55,636 KB
testcase_18 AC 165 ms
55,608 KB
testcase_19 AC 166 ms
55,840 KB
testcase_20 AC 164 ms
55,948 KB
testcase_21 AC 163 ms
55,504 KB
testcase_22 AC 164 ms
55,800 KB
testcase_23 AC 164 ms
55,536 KB
testcase_24 AC 165 ms
55,624 KB
testcase_25 AC 163 ms
53,212 KB
testcase_26 AC 163 ms
55,604 KB
testcase_27 AC 162 ms
55,576 KB
testcase_28 AC 165 ms
55,756 KB
testcase_29 AC 165 ms
55,564 KB
testcase_30 AC 164 ms
55,492 KB
testcase_31 AC 164 ms
55,616 KB
testcase_32 AC 164 ms
55,300 KB
testcase_33 AC 165 ms
55,612 KB
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ソースコード

diff #

import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;


public class Main {

	public static void main(String[] args) {
		FastScanner sc = new FastScanner();
		double x = Double.parseDouble(sc.next());

		double org = Math.PI * Math.PI / 6;

		double a = 0;
		double b = 0;
		for (double n = 1; n < 10000000; n ++) {
			a += 1.0 / ((x + n) * (x + n));
			b += 1.0 / (n * n);
		}
		
		a += (org - b);
		System.out.printf("%.15f%n", a);
	}
}



class FastScanner {
	public static String debug = null;

	private final InputStream in = System.in;
	private int ptr = 0;
	private int buflen = 0;
	private byte[] buffer = new byte[1024];
	private boolean eos = false;

	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				if (debug != null) {
					buflen = debug.length();
					buffer = debug.getBytes();
					debug = "";
					eos = true;
				} else {
					buflen = in.read(buffer);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen < 0) {
				eos = true;
				return false;
			} else if (buflen == 0) {
				return false;
			}
		}
		return true;
	}

	private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	}

	private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	}

	private void skipUnprintable() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
	}

	public boolean isEOS() {
		return this.eos;
	}

	public boolean hasNext() {
		skipUnprintable();
		return hasNextByte();
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public int nextInt() {
		return (int) nextLong();
	}

	public long[] nextLongList(int n) {
		return nextLongTable(1, n)[0];
	}

	public int[] nextIntList(int n) {
		return nextIntTable(1, n)[0];
	}

	public long[][] nextLongTable(int n, int m) {
		long[][] ret = new long[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextLong();
			}
		}
		return ret;
	}

	public int[][] nextIntTable(int n, int m) {
		int[][] ret = new int[n][m];
		for (int i = 0; i < n; i ++) {
			for (int j = 0; j < m; j ++) {
				ret[i][j] = nextInt();
			}
		}
		return ret;
	}
}
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