Submission #891177
Source Code Expand
import java.io.IOException; import java.io.InputStream; import java.util.NoSuchElementException; public class Main { static final long C = 1000000007; static final int CY = 1000000000; StringBuilder sb; public void calc() { sb = new StringBuilder(); FastScanner sc = new FastScanner(); int n = sc.nextInt(); int[] a = new int[n]; for (int i=0; i < n; i++) { a[i] = sc.nextInt(); } long ans = 0; for (int i=0; i< n; i++) { if (a[a[i]-1] == i) { ans++; } } System.out.println(ans); } public static void main(String[] args) { Main main = new Main(); main.calc(); } static class FastScanner { private final InputStream in = System.in; private final byte[] buffer = new byte[1024]; private int ptr = 0; private int buflen = 0; private boolean hasNextByte() { if (ptr < buflen) { return true; }else{ ptr = 0; try { buflen = in.read(buffer); } catch (IOException e) { e.printStackTrace(); } 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 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() { if (!hasNext()) throw new NoSuchElementException(); int 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(); } } } }
Submission Info
Submission Time | |
---|---|
Task | B - Friendly Rabbits |
User | kiki33 |
Language | Java8 (OpenJDK 1.8.0) |
Score | 0 |
Code Size | 2820 Byte |
Status | WA |
Exec Time | 133 ms |
Memory | 9528 KB |
Judge Result
Set Name | Sample | All | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 0 / 200 | ||||||||
Status |
|
|
Set Name | Test Cases |
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Sample | 0_00.txt, 0_01.txt, 0_02.txt |
All | 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
0_00.txt | WA | 95 ms | 8016 KB |
0_01.txt | WA | 97 ms | 8148 KB |
0_02.txt | AC | 95 ms | 8016 KB |
1_00.txt | WA | 96 ms | 8016 KB |
1_01.txt | WA | 125 ms | 9300 KB |
1_02.txt | AC | 125 ms | 9396 KB |
1_03.txt | WA | 124 ms | 9428 KB |
1_04.txt | WA | 118 ms | 9396 KB |
1_05.txt | WA | 133 ms | 9428 KB |
1_06.txt | WA | 129 ms | 9528 KB |
1_07.txt | AC | 129 ms | 9528 KB |
1_08.txt | WA | 119 ms | 9172 KB |
1_09.txt | AC | 128 ms | 9268 KB |
1_10.txt | WA | 128 ms | 9528 KB |
1_11.txt | AC | 113 ms | 9032 KB |