Submission #286595
Source Code Expand
import java.io.*;
import java.math.*;
import java.util.*;
import static java.util.Arrays.*;
public class Main {
private static final int mod = (int)1e9+7;
final Random random = new Random(0);
final IOFast io = new IOFast();
/// MAIN CODE
public void run() throws IOException {
// int TEST_CASE = Integer.parseInt(new String(io.nextLine()).trim());
int TEST_CASE = 1;
while(TEST_CASE-- != 0) {
int n = io.nextInt();
int k = io.nextInt();
if(k == 1) {
io.out.println("YES");
}
else {
n--;
// System.err.println((n - 1) / 2 - 1);
io.out.println((n - 1) / 2 + 1 >= k ? "YES" : "NO");
}
}
}
/// TEMPLATE
static int gcd(int n, int r) { return r == 0 ? n : gcd(r, n%r); }
static long gcd(long n, long r) { return r == 0 ? n : gcd(r, n%r); }
static <T> void swap(T[] x, int i, int j) { T t = x[i]; x[i] = x[j]; x[j] = t; }
static void swap(int[] x, int i, int j) { int t = x[i]; x[i] = x[j]; x[j] = t; }
void main() throws IOException {
// IOFast.setFileIO("rle-size.in", "rle-size.out");
try { run(); }
catch (EndOfFileRuntimeException e) { }
io.out.flush();
}
public static void main(String[] args) throws IOException { new Main().main(); }
static class EndOfFileRuntimeException extends RuntimeException {
private static final long serialVersionUID = -8565341110209207657L; }
static
public class IOFast {
private BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
private PrintWriter out = new PrintWriter(System.out);
void setFileIn(String ins) throws IOException { in.close(); in = new BufferedReader(new FileReader(ins)); }
void setFileOut(String outs) throws IOException { out.flush(); out.close(); out = new PrintWriter(new FileWriter(outs)); }
void setFileIO(String ins, String outs) throws IOException { setFileIn(ins); setFileOut(outs); }
private static int pos, readLen;
private static final char[] buffer = new char[1024 * 8];
private static char[] str = new char[500*8*2];
private static boolean[] isDigit = new boolean[256];
private static boolean[] isSpace = new boolean[256];
private static boolean[] isLineSep = new boolean[256];
static { for(int i = 0; i < 10; i++) { isDigit['0' + i] = true; } isDigit['-'] = true; isSpace[' '] = isSpace['\r'] = isSpace['\n'] = isSpace['\t'] = true; isLineSep['\r'] = isLineSep['\n'] = true; }
public int read() throws IOException { if(pos >= readLen) { pos = 0; readLen = in.read(buffer); if(readLen <= 0) { throw new EndOfFileRuntimeException(); } } return buffer[pos++]; }
public int nextInt() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; int ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; }
public long nextLong() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); int i = 0; long ret = 0; if(str[0] == '-') { i = 1; } for(; i < len; i++) ret = ret * 10 + str[i] - '0'; if(str[0] == '-') { ret = -ret; } return ret; }
public char nextChar() throws IOException { while(true) { final int c = read(); if(!isSpace[c]) { return (char)c; } } }
int reads(int len, boolean[] accept) throws IOException { try { while(true) { final int c = read(); if(accept[c]) { break; } if(str.length == len) { char[] rep = new char[str.length * 3 / 2]; System.arraycopy(str, 0, rep, 0, str.length); str = rep; } str[len++] = (char)c; } } catch(EndOfFileRuntimeException e) { ; } return len; }
int reads(char[] cs, int len, boolean[] accept) throws IOException { try { while(true) { final int c = read(); if(accept[c]) { break; } cs[len++] = (char)c; } } catch(EndOfFileRuntimeException e) { ; } return len; }
public char[] nextLine() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isLineSep); try { if(str[len-1] == '\r') { len--; read(); } } catch(EndOfFileRuntimeException e) { ; } return Arrays.copyOf(str, len); }
public String nextString() throws IOException { return new String(next()); }
public char[] next() throws IOException { int len = 0; str[len++] = nextChar(); len = reads(len, isSpace); return Arrays.copyOf(str, len); }
public int next(char[] cs) throws IOException { int len = 0; cs[len++] = nextChar(); len = reads(cs, len, isSpace); return len; }
public double nextDouble() throws IOException { return Double.parseDouble(nextString()); }
public long[] nextLongArray(final int n) throws IOException { final long[] res = new long[n]; for(int i = 0; i < n; i++) { res[i] = nextLong(); } return res; }
public int[] nextIntArray(final int n) throws IOException { final int[] res = new int[n]; for(int i = 0; i < n; i++) { res[i] = nextInt(); } return res; }
public int[][] nextIntArray2D(final int n, final int k) throws IOException { final int[][] res = new int[n][]; for(int i = 0; i < n; i++) { res[i] = nextIntArray(k); } return res; }
public int[][] nextIntArray2DWithIndex(final int n, final int k) throws IOException { final int[][] res = new int[n][k+1]; for(int i = 0; i < n; i++) { for(int j = 0; j < k; j++) { res[i][j] = nextInt(); } res[i][k] = i; } return res; }
public double[] nextDoubleArray(final int n) throws IOException { final double[] res = new double[n]; for(int i = 0; i < n; i++) { res[i] = nextDouble(); } return res; }
}
}
Submission Info
Submission Time |
|
Task |
A - 閉路グラフ |
User |
tanzaku |
Language |
Java (OpenJDK 1.7.0) |
Score |
100 |
Code Size |
5452 Byte |
Status |
AC |
Exec Time |
406 ms |
Memory |
20812 KB |
Judge Result
Set Name |
Sample |
All |
Score / Max Score |
0 / 0 |
100 / 100 |
Status |
|
|
Set Name |
Test Cases |
Sample |
subtask0_sample_01.txt, subtask0_sample_02.txt, subtask0_sample_03.txt, subtask0_sample_04.txt |
All |
subtask0_sample_01.txt, subtask0_sample_02.txt, subtask0_sample_03.txt, subtask0_sample_04.txt, subtask1_01.txt, subtask1_02.txt, subtask1_03.txt, subtask1_04.txt, subtask1_05.txt, subtask1_06.txt, subtask1_07.txt, subtask1_08.txt, subtask1_09.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt, subtask1_13.txt, subtask1_14.txt, subtask1_15.txt, subtask1_16.txt, subtask1_17.txt, subtask1_18.txt, subtask1_19.txt, subtask1_20.txt, subtask1_21.txt, subtask1_22.txt, subtask1_23.txt, subtask1_24.txt, subtask1_25.txt, subtask1_26.txt |
Case Name |
Status |
Exec Time |
Memory |
subtask0_sample_01.txt |
AC |
386 ms |
20748 KB |
subtask0_sample_02.txt |
AC |
395 ms |
20748 KB |
subtask0_sample_03.txt |
AC |
394 ms |
20812 KB |
subtask0_sample_04.txt |
AC |
406 ms |
20652 KB |
subtask1_01.txt |
AC |
381 ms |
20780 KB |
subtask1_02.txt |
AC |
384 ms |
20692 KB |
subtask1_03.txt |
AC |
395 ms |
20780 KB |
subtask1_04.txt |
AC |
384 ms |
20736 KB |
subtask1_05.txt |
AC |
380 ms |
20788 KB |
subtask1_06.txt |
AC |
386 ms |
20732 KB |
subtask1_07.txt |
AC |
386 ms |
20776 KB |
subtask1_08.txt |
AC |
388 ms |
20776 KB |
subtask1_09.txt |
AC |
397 ms |
20792 KB |
subtask1_10.txt |
AC |
388 ms |
20668 KB |
subtask1_11.txt |
AC |
385 ms |
20680 KB |
subtask1_12.txt |
AC |
398 ms |
20720 KB |
subtask1_13.txt |
AC |
389 ms |
20740 KB |
subtask1_14.txt |
AC |
383 ms |
20704 KB |
subtask1_15.txt |
AC |
377 ms |
20704 KB |
subtask1_16.txt |
AC |
378 ms |
20748 KB |
subtask1_17.txt |
AC |
384 ms |
20736 KB |
subtask1_18.txt |
AC |
378 ms |
20788 KB |
subtask1_19.txt |
AC |
384 ms |
20736 KB |
subtask1_20.txt |
AC |
381 ms |
20660 KB |
subtask1_21.txt |
AC |
386 ms |
20680 KB |
subtask1_22.txt |
AC |
385 ms |
20740 KB |
subtask1_23.txt |
AC |
393 ms |
20660 KB |
subtask1_24.txt |
AC |
391 ms |
20656 KB |
subtask1_25.txt |
AC |
391 ms |
20660 KB |
subtask1_26.txt |
AC |
385 ms |
20780 KB |