結果
問題 | No.245 貫け! |
ユーザー |
|
提出日時 | 2020-04-03 02:25:00 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 143 ms / 5,000 ms |
コード長 | 3,578 bytes |
コンパイル時間 | 2,245 ms |
コンパイル使用メモリ | 77,916 KB |
実行使用メモリ | 40,080 KB |
最終ジャッジ日時 | 2024-06-28 17:34:35 |
合計ジャッジ時間 | 4,827 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 16 |
ソースコード
import java.io.IOException;import java.io.InputStream;import java.util.Arrays;import java.util.NoSuchElementException;class Main {public static void main(String[] args) {new Main().run();}// (a,b),(c,d)を通る直線long[] f(long a,long b,long c,long d) {if(a==c&&b==d)throw new AssertionError();return new long[]{b-d,-(a-c),a*d-b*c};}// ax+by+c=0int eval(long a,long b,long c,long x,long y) {return (int)Math.signum(a*x+b*y+c);}int cnt(int e0,int e1) {if(e0*e1==1)return 0;else return 1;}void run() {FastScanner sc=new FastScanner();int N=sc.nextInt();long[][] x=new long[N][2];long[][] y=new long[N][2];for(int i=0;i<N;++i) {x[i][0]=sc.nextLong();y[i][0]=sc.nextLong();x[i][1]=sc.nextLong();y[i][1]=sc.nextLong();}int ans=1;for(int i0=0;i0<N;++i0) {for(int i1=0;i1<=1;++i1) {for(int j0=i0+1;j0<N;++j0) {for(int j1=0;j1<=1;++j1) {if(x[i0][i1]==x[j0][j1]&&y[i0][i1]==y[j0][j1])continue;long[] line=f(x[i0][i1], y[i0][i1], x[j0][j1], y[j0][j1]);int cur=2;for(int k=0;k<N;++k) {if(k==i0||k==j0)continue;int e0=eval(line[0], line[1], line[2], x[k][0], y[k][0]);int e1=eval(line[0], line[1], line[2], x[k][1], y[k][1]);cur+=cnt(e0, e1);}ans=Math.max(ans, cur);}}}}System.out.println(ans);}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;}public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; 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() {long nl = nextLong();if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();return (int) nl;}public double nextDouble() { return Double.parseDouble(next());}}