結果

問題 No.723 2つの数の和
ユーザー holegumaholeguma
提出日時 2019-07-17 21:03:37
言語 Java21
(openjdk 21)
結果
AC  
実行時間 97 ms / 2,000 ms
コード長 3,336 bytes
コンパイル時間 2,360 ms
コンパイル使用メモリ 77,892 KB
実行使用メモリ 40,656 KB
最終ジャッジ日時 2024-06-02 11:02:48
合計ジャッジ時間 5,119 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge4
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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 48 ms
38,512 KB
testcase_01 AC 49 ms
38,304 KB
testcase_02 AC 46 ms
38,296 KB
testcase_03 AC 90 ms
40,436 KB
testcase_04 AC 95 ms
40,488 KB
testcase_05 AC 93 ms
40,556 KB
testcase_06 AC 97 ms
40,656 KB
testcase_07 AC 80 ms
39,712 KB
testcase_08 AC 82 ms
39,676 KB
testcase_09 AC 90 ms
40,436 KB
testcase_10 AC 79 ms
39,796 KB
testcase_11 AC 59 ms
38,892 KB
testcase_12 AC 76 ms
40,456 KB
testcase_13 AC 47 ms
38,016 KB
testcase_14 AC 47 ms
38,112 KB
testcase_15 AC 45 ms
38,392 KB
testcase_16 AC 45 ms
37,972 KB
testcase_17 AC 45 ms
38,116 KB
testcase_18 AC 68 ms
40,276 KB
testcase_19 AC 97 ms
40,368 KB
testcase_20 AC 47 ms
38,172 KB
testcase_21 AC 48 ms
38,196 KB
testcase_22 AC 47 ms
38,244 KB
testcase_23 AC 93 ms
40,188 KB
testcase_24 AC 80 ms
39,688 KB
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ソースコード

diff # 

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;

public class Main {

	static PrintWriter out;
	static InputReader ir;

	static void solve() {
		int n = ir.nextInt();
		int x = ir.nextInt();
		long[] ct = new long[200001];
		if (x > 200000) {
			out.println(0);
			return;
		}
		int[] a = ir.nextIntArray(n);
		for (int i : a)
			ct[i]++;
		long res = 0;
		for (int i = 0; i <= x; i++) {
			res += ct[x - i] * ct[i];
		}
		out.println(res);
	}

	public static void main(String[] args) {
		ir = new InputReader(System.in);
		out = new PrintWriter(System.out);
		solve();
		out.flush();
	}

	static class InputReader {

		private InputStream in;
		private byte[] buffer = new byte[1024];
		private int curbuf;
		private int lenbuf;

		public InputReader(InputStream in) {
			this.in = in;
			this.curbuf = this.lenbuf = 0;
		}

		public boolean hasNextByte() {
			if (curbuf >= lenbuf) {
				curbuf = 0;
				try {
					lenbuf = in.read(buffer);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (lenbuf <= 0)
					return false;
			}
			return true;
		}

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

		private boolean isSpaceChar(int c) {
			return !(c >= 33 && c <= 126);
		}

		private void skip() {
			while (hasNextByte() && isSpaceChar(buffer[curbuf]))
				curbuf++;
		}

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

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

		public int nextInt() {
			if (!hasNext())
				throw new NoSuchElementException();
			int c = readByte();
			while (isSpaceChar(c))
				c = readByte();
			boolean minus = false;
			if (c == '-') {
				minus = true;
				c = readByte();
			}
			int res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res = res * 10 + c - '0';
				c = readByte();
			} while (!isSpaceChar(c));
			return (minus) ? -res : res;
		}

		public long nextLong() {
			if (!hasNext())
				throw new NoSuchElementException();
			int c = readByte();
			while (isSpaceChar(c))
				c = readByte();
			boolean minus = false;
			if (c == '-') {
				minus = true;
				c = readByte();
			}
			long res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res = res * 10 + c - '0';
				c = readByte();
			} while (!isSpaceChar(c));
			return (minus) ? -res : res;
		}

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

		public int[] nextIntArray(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = nextInt();
			return a;
		}

		public long[] nextLongArray(int n) {
			long[] a = new long[n];
			for (int i = 0; i < n; i++)
				a[i] = nextLong();
			return a;
		}

		public char[][] nextCharMap(int n, int m) {
			char[][] map = new char[n][m];
			for (int i = 0; i < n; i++)
				map[i] = next().toCharArray();
			return map;
		}
	}

	static void tr(Object... o) {
		out.println(Arrays.deepToString(o));
	}
}
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