結果

問題 No.723 2つの数の和
ユーザー tutuztutuz
提出日時 2018-09-03 00:23:17
言語 Java21
(openjdk 21)
結果
AC  
実行時間 287 ms / 2,000 ms
コード長 3,563 bytes
コンパイル時間 2,529 ms
コンパイル使用メモリ 78,216 KB
実行使用メモリ 56,868 KB
最終ジャッジ日時 2024-10-04 07:10:39
合計ジャッジ時間 7,597 ms
ジャッジサーバーID
(参考情報)
judge2 / judge3
このコードへのチャレンジ
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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 49 ms
50,232 KB
testcase_01 AC 48 ms
50,096 KB
testcase_02 AC 48 ms
50,276 KB
testcase_03 AC 287 ms
56,620 KB
testcase_04 AC 281 ms
56,760 KB
testcase_05 AC 260 ms
56,512 KB
testcase_06 AC 260 ms
56,868 KB
testcase_07 AC 183 ms
55,484 KB
testcase_08 AC 183 ms
56,112 KB
testcase_09 AC 271 ms
56,448 KB
testcase_10 AC 182 ms
55,728 KB
testcase_11 AC 107 ms
52,160 KB
testcase_12 AC 199 ms
56,348 KB
testcase_13 AC 270 ms
56,808 KB
testcase_14 AC 150 ms
54,640 KB
testcase_15 AC 186 ms
55,296 KB
testcase_16 AC 237 ms
56,564 KB
testcase_17 AC 261 ms
56,468 KB
testcase_18 AC 202 ms
56,600 KB
testcase_19 AC 202 ms
56,392 KB
testcase_20 AC 49 ms
50,424 KB
testcase_21 AC 48 ms
49,992 KB
testcase_22 AC 49 ms
50,460 KB
testcase_23 AC 249 ms
56,400 KB
testcase_24 AC 163 ms
55,528 KB
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ソースコード

diff #

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.StringTokenizer;

public class Main {

	public static void main(String[] args) throws IOException {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskX solver = new TaskX();
		solver.solve(1, in, out);
		out.close();
	}

	static int INF = 1 << 30;
	static long LINF = 1L << 55;
	static int MOD = 1000000007;
	static int[] mh4 = { 0, -1, 1, 0 };
	static int[] mw4 = { -1, 0, 0, 1 };
	static int[] mh8 = { -1, -1, -1, 0, 0, 1, 1, 1 };
	static int[] mw8 = { -1, 0, 1, -1, 1, -1, 0, 1 };

	static class TaskX {

		public void solve(int testNumber, InputReader in, PrintWriter out) {

			int n = in.nextInt(), x = in.nextInt();
			int[] a = in.nextIntArray(n);
			Arrays.sort(a);

			long ans = 0;
			for (int i = 0; i < n; i++) {
				int l = lowerBound(a, x-a[i]);
				int r = upperBound(a, x-a[i]);
				ans += r - l;
			}

			out.println(ans);

		}

		public static int lowerBound(int[] a, int obj) {
			int l = 0, r = a.length - 1;
			while (r - l >= 0) {
				int c = (l + r) / 2;
				if (obj <= a[c]) {
					r = c - 1;
				} else {
					l = c + 1;
				}
			}
			return l;
		}

		public static int upperBound(int[] a, int obj) {
			int l = 0, r = a.length - 1;
			while (r - l >= 0) {
				int c = (l + r) / 2;
				if (a[c] <= obj) {
					l = c + 1;
				} else {
					r = c - 1;
				}
			}
			return l;
		}
	}

	static class InputReader {
		BufferedReader in;
		StringTokenizer tok;

		public String nextString() {
			while (!tok.hasMoreTokens()) {
				try {
					tok = new StringTokenizer(in.readLine(), " ");
				} catch (IOException e) {
					throw new InputMismatchException();
				}
			}
			return tok.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(nextString());
		}

		public long nextLong() {
			return Long.parseLong(nextString());
		}

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

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

		public int[] nextIntArrayDec(int n) {
			int[] res = new int[n];
			for (int i = 0; i < n; i++) {
				res[i] = nextInt() - 1;
			}
			return res;
		}

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

		public long[] nextLongArrayDec(int n) {
			long[] res = new long[n];
			for (int i = 0; i < n; i++) {
				res[i] = nextLong() - 1;
			}
			return res;
		}

		public InputReader(InputStream inputStream) {
			in = new BufferedReader(new InputStreamReader(inputStream));
			tok = new StringTokenizer("");
		}
	}

	static long max(long... n) {
		long ret = n[0];
		for (int i = 0; i < n.length; i++) {
			ret = Math.max(ret, n[i]);
		}
		return ret;
	}

	static int max(int... n) {
		int ret = n[0];
		for (int i = 0; i < n.length; i++) {
			ret = Math.max(ret, n[i]);
		}
		return ret;
	}

	static long min(long... n) {
		long ret = n[0];
		for (int i = 0; i < n.length; i++) {
			ret = Math.min(ret, n[i]);
		}
		return ret;
	}

	static int min(int... n) {
		int ret = n[0];
		for (int i = 0; i < n.length; i++) {
			ret = Math.min(ret, n[i]);
		}
		return ret;
	}

}
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