結果

問題 No.955 ax^2+bx+c=0
ユーザー uwiuwi
提出日時 2019-12-18 14:38:49
言語 Java21
(openjdk 21)
結果
TLE  
実行時間 -
コード長 4,955 bytes
コンパイル時間 4,214 ms
コンパイル使用メモリ 81,240 KB
実行使用メモリ 59,256 KB
最終ジャッジ日時 2024-07-07 00:44:07
合計ジャッジ時間 12,071 ms
ジャッジサーバーID
(参考情報)
judge2 / judge1
このコードへのチャレンジ
(要ログイン)

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 125 ms
46,812 KB
testcase_01 AC 124 ms
41,172 KB
testcase_02 AC 53 ms
37,056 KB
testcase_03 AC 53 ms
36,764 KB
testcase_04 AC 53 ms
36,852 KB
testcase_05 AC 52 ms
36,884 KB
testcase_06 AC 55 ms
36,952 KB
testcase_07 AC 55 ms
36,904 KB
testcase_08 AC 54 ms
36,664 KB
testcase_09 AC 55 ms
36,872 KB
testcase_10 AC 53 ms
36,980 KB
testcase_11 AC 54 ms
37,076 KB
testcase_12 AC 53 ms
36,992 KB
testcase_13 AC 55 ms
36,992 KB
testcase_14 AC 113 ms
39,620 KB
testcase_15 AC 112 ms
39,824 KB
testcase_16 AC 126 ms
41,040 KB
testcase_17 AC 126 ms
41,300 KB
testcase_18 AC 113 ms
39,624 KB
testcase_19 AC 112 ms
40,040 KB
testcase_20 AC 112 ms
39,792 KB
testcase_21 AC 111 ms
39,932 KB
testcase_22 AC 113 ms
39,840 KB
testcase_23 AC 126 ms
40,820 KB
testcase_24 AC 123 ms
41,108 KB
testcase_25 AC 123 ms
40,916 KB
testcase_26 AC 123 ms
40,924 KB
testcase_27 AC 123 ms
40,916 KB
testcase_28 AC 111 ms
40,120 KB
testcase_29 AC 111 ms
39,944 KB
testcase_30 AC 113 ms
39,620 KB
testcase_31 AC 125 ms
41,164 KB
testcase_32 AC 124 ms
41,076 KB
testcase_33 AC 122 ms
40,888 KB
testcase_34 TLE -
testcase_35 -- -
testcase_36 -- -
testcase_37 -- -
testcase_38 -- -
testcase_39 -- -
testcase_40 -- -
testcase_41 -- -
testcase_42 -- -
testcase_43 -- -
testcase_44 -- -
testcase_45 -- -
testcase_46 -- -
testcase_47 -- -
testcase_48 -- -
testcase_49 -- -
testcase_50 -- -
testcase_51 -- -
testcase_52 -- -
testcase_53 -- -
testcase_54 -- -
testcase_55 -- -
testcase_56 -- -
testcase_57 -- -
testcase_58 -- -
testcase_59 -- -
testcase_60 -- -
testcase_61 -- -
testcase_62 -- -
testcase_63 -- -
testcase_64 -- -
testcase_65 -- -
testcase_66 -- -
testcase_67 -- -
testcase_68 -- -
testcase_69 -- -
testcase_70 -- -
testcase_71 -- -
testcase_72 -- -
testcase_73 -- -
testcase_74 -- -
testcase_75 -- -
testcase_76 -- -
testcase_77 -- -
testcase_78 -- -
testcase_79 -- -
testcase_80 -- -
testcase_81 -- -
testcase_82 -- -
testcase_83 -- -
testcase_84 -- -
testcase_85 -- -
testcase_86 -- -
testcase_87 -- -
testcase_88 -- -
testcase_89 -- -
testcase_90 -- -
testcase_91 -- -
testcase_92 -- -
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testcase_102 -- -
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testcase_106 -- -
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testcase_108 -- -
testcase_109 -- -
testcase_110 -- -
testcase_111 -- -
testcase_112 -- -
testcase_113 -- -
testcase_114 -- -
testcase_115 -- -
testcase_116 -- -
testcase_117 -- -
testcase_118 -- -
testcase_119 -- -
testcase_120 -- -
testcase_121 -- -
testcase_122 -- -
testcase_123 -- -
testcase_124 -- -
権限があれば一括ダウンロードができます

ソースコード

diff #

package adv2019;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class D17 {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		long a = nl(), b = nl(), c = nl();
		long[][] res = solveQuad(a, b, c);
		if(res == null){
			out.println(-1);
		}else{
			out.println(res.length);
			for(long[] u : res){
				out.printf("%.14f\n", (u[0] + u[1] * Math.sqrt(u[2])) / u[3]);
			}
		}
	}
	
	public static long[][] solveQuad(long A, long B, long C)
	{
		if(A == 0){
			if(B == 0){
				return C == 0 ? null : new long[0][];
			}else{
				return new long[][]{reducex(new long[]{-C, 0, 0, B})};
			}
		}
		
		long D = B*B-4*A*C;
		if(D < 0){
			return new long[0][];
		}else if(D == 0){
			return new long[][]{reducex(new long[]{-B, 0, 0, 2L*A})};
		}else{
			if(A > 0){
				return new long[][]{
						reducex(new long[]{-B, -1, D, 2L*A}),
						reducex(new long[]{-B, 1, D, 2L*A})
				};
			}else{
				return new long[][]{
						reducex(new long[]{-B, 1, D, 2L*A}),
						reducex(new long[]{-B, -1, D, 2L*A})
				};
			}
		}
	}
	
	public static long[] reducex(long[] f)
	{
		// f[2] < 0 ??
		if(f[2] == 0)f[1] = 0;
		if(f[1] == 0)f[2] = 0;
		if(f[2] == 0 || f[1] == 0){
			// normal fraction
			if(f[3] == 0) { // n/0
				f[0] = 1;
			}else if(f[0] == 0) { // 0/n
				f[3] = 1;
			}else {
				if(f[3] < 0) { // -a/-b ->a/b
					f[0] = -f[0];
					f[3] = -f[3];
				}
				long a = Math.abs(f[0]), b = f[3];
				while (b > 0) {
					long c = a;
					a = b;
					b = c % b;
				}
				f[0] /= a;
				f[3] /= a;
			}
		}else{
			for(long p = 2;p * p <= f[2];p++){
				while(f[2] % (p*p) == 0){
					f[1] *= p;
					f[2] /= p*p;
				}
			}
			if(f[3] == 0) { // n/0
				f[0] = 1;
				f[1] = f[2] = 0;
			}else {
				if(f[3] < 0) { // -a/-b ->a/b
					f[0] = -f[0];
					f[1] = -f[1];
					f[3] = -f[3];
				}
				long a = Math.abs(f[0]), b = f[3];
				while (b > 0) {
					long c = a;
					a = b;
					b = c % b;
				}
				b = Math.abs(f[1]);
				while (b > 0) {
					long c = a;
					a = b;
					b = c % b;
				}
				
				f[0] /= a;
				f[1] /= a;
				f[3] /= a;
			}
		}
		return f;
	}

	
	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 D17().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)); }
}
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