結果
問題 | No.274 The Wall |
ユーザー |
|
提出日時 | 2020-03-29 03:21:27 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 230 ms / 2,000 ms |
コード長 | 3,509 bytes |
コンパイル時間 | 2,409 ms |
コンパイル使用メモリ | 80,344 KB |
実行使用メモリ | 57,772 KB |
最終ジャッジ日時 | 2024-06-22 02:36:49 |
合計ジャッジ時間 | 8,180 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 22 |
ソースコード
import java.io.IOException;import java.io.InputStream;import java.util.Arrays;import java.util.Comparator;import java.util.NoSuchElementException;import java.util.Scanner;public class Main {public static void main(String[] args) {//long t = System.currentTimeMillis();new Main().run();//System.err.println(System.currentTimeMillis() - t);}int flip(int pos,int W) {return W-1-pos;}void run() {Scanner sc=new Scanner(System.in);int N=sc.nextInt();int M=sc.nextInt();int[][] A=new int[N][2];for(int i=0;i<N;++i) {A[i][0]=sc.nextInt();A[i][1]=flip(sc.nextInt(),M);if(A[i][0]>A[i][1]) {A[i][0]^=A[i][1];A[i][1]^=A[i][0];A[i][0]^=A[i][1];}}Arrays.sort(A,new Comparator<int[]>() {@Overridepublic int compare(int[] o1, int[] o2) {return Long.compare(o1[0], o2[0]);}});int s=0,t=0;//[0..s),(M-1-t..M-1]が埋まっているfor(int i=0;i<N;++i) {int ns=s,nt=t;boolean left =s<=A[i][0]&&t<=A[i][1];boolean right=s<=A[i][1]&&t<=A[i][0];if(!left&&!right) {System.out.println("NO");return;}else if(left&&right) {if(s>=t) {ns=flip(A[i][1],M)+1;}else {nt=flip(A[i][1],M)+1;}}else if(left) {ns=flip(A[i][1],M)+1;}else if(right) {nt=flip(A[i][1],M)+1;}if(s>ns||t>nt||ns-1>M-1-nt) {System.out.println("NO");return;}s=ns;t=nt;}System.out.println("YES");}static void tr(Object... objects) {System.out.println(Arrays.deepToString(objects));}}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() {return (int)nextLong();}}