結果
問題 | No.1072 A Nice XOR Pair |
ユーザー | uwi |
提出日時 | 2020-06-05 23:47:25 |
言語 | Java21 (openjdk 21) |
結果 |
AC
|
実行時間 | 337 ms / 2,000 ms |
コード長 | 3,721 bytes |
コンパイル時間 | 4,098 ms |
コンパイル使用メモリ | 82,996 KB |
実行使用メモリ | 67,244 KB |
最終ジャッジ日時 | 2024-12-17 19:09:42 |
合計ジャッジ時間 | 6,277 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 | 51 ms
50,320 KB |
testcase_01 | AC | 51 ms
50,240 KB |
testcase_02 | AC | 52 ms
50,384 KB |
testcase_03 | AC | 52 ms
50,268 KB |
testcase_04 | AC | 51 ms
50,408 KB |
testcase_05 | AC | 52 ms
50,232 KB |
testcase_06 | AC | 57 ms
50,376 KB |
testcase_07 | AC | 337 ms
67,244 KB |
testcase_08 | AC | 192 ms
54,612 KB |
testcase_09 | AC | 158 ms
55,168 KB |
testcase_10 | AC | 174 ms
55,036 KB |
testcase_11 | AC | 232 ms
60,624 KB |
testcase_12 | AC | 317 ms
64,916 KB |
ソースコード
package contest200605; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Arrays; import java.util.HashMap; import java.util.InputMismatchException; import java.util.Map; public class B2 { InputStream is; PrintWriter out; String INPUT = ""; void solve() { int n = ni(), X = ni(); int[] a = na(n); Map<Integer, Integer> map = new HashMap<>(); for(int v : a){ map.put(v, map.getOrDefault(v, 0) + 1); } long ans = 0; for(int v : a){ ans += map.getOrDefault(v^X, 0); } out.println((ans-(X == 0 ? n : 0))/2); } public static int lowerBound(int[] a, int v){ return lowerBound(a, 0, a.length, v); } public static int lowerBound(int[] a, int l, int r, int v) { if(l > r || l < 0 || r > a.length)throw new IllegalArgumentException(); int low = l-1, high = r; while(high-low > 1){ int h = high+low>>>1; if(a[h] >= v){ high = h; }else{ low = h; } } return high; } void run() throws Exception { is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes()); out = new PrintWriter(System.out); long s = System.currentTimeMillis(); solve(); out.flush(); if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms"); // Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){ // @Override // public void run() { // long s = System.currentTimeMillis(); // solve(); // out.flush(); // if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms"); // } // }; // t.start(); // t.join(); } public static void main(String[] args) throws Exception { new B2().run(); } private byte[] inbuf = new byte[1024]; public int lenbuf = 0, ptrbuf = 0; private int readByte() { if(lenbuf == -1)throw new InputMismatchException(); if(ptrbuf >= lenbuf){ ptrbuf = 0; try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); } if(lenbuf <= 0)return -1; } return inbuf[ptrbuf++]; } private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); } private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; } private double nd() { return Double.parseDouble(ns()); } private char nc() { return (char)skip(); } private String ns() { int b = skip(); StringBuilder sb = new StringBuilder(); while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ') sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } private char[] ns(int n) { char[] buf = new char[n]; int b = skip(), p = 0; while(p < n && !(isSpaceChar(b))){ buf[p++] = (char)b; b = readByte(); } return n == p ? buf : Arrays.copyOf(buf, p); } private int[] na(int n) { int[] a = new int[n]; for(int i = 0;i < n;i++)a[i] = ni(); return a; } private long[] nal(int n) { long[] a = new long[n]; for(int i = 0;i < n;i++)a[i] = nl(); return a; } private char[][] nm(int n, int m) { char[][] map = new char[n][]; for(int i = 0;i < n;i++)map[i] = ns(m); return map; } private int[][] nmi(int n, int m) { int[][] map = new int[n][]; for(int i = 0;i < n;i++)map[i] = na(m); return map; } private int ni() { return (int)nl(); } private long nl() { long num = 0; int b; boolean minus = false; while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')); if(b == '-'){ minus = true; b = readByte(); } while(true){ if(b >= '0' && b <= '9'){ num = num * 10 + (b - '0'); }else{ return minus ? -num : num; } b = readByte(); } } private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); } }