#477189 (Java) No.955 ax^2+bx+c=0

• 問題: No.955 ax^2+bx+c=0
• ユーザー: Suunn
• 提出日時: 2020-05-07 07:52:57
• 言語: Java (openjdk 23)
• 結果: AC
• 実行時間: 53 ms / 2,000 ms
• コード長: 5,859 bytes
• コンパイル時間: 2,864 ms
• コンパイル使用メモリ: 80,024 KB
• 実行使用メモリ: 37,376 KB
• 最終ジャッジ日時: 2024-07-03 09:17:37
• 合計ジャッジ時間: 10,524 ms
• ジャッジサーバーID （参考情報）: judge1 / judge3

ファイルパターン	結果
sample	AC * 3
other	AC * 122

ソースコード

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.NoSuchElementException;
import java.util.Queue;
import java.util.Scanner;
import java.util.TreeMap;
import java.util.TreeSet;

public class Main {
	static MLScanner sc = new MLScanner(System.in);
	static PrintWriter ot = new PrintWriter(System.out);
	static String sp = " ";
	public static void main(String[] args) {
		int T = 1;
		for(int i=0;i<T;i++) {
			long A = sc.nextLong();
			long B = sc.nextLong();
			long C = sc.nextLong();
			double a = A;
			double b = B;
			double c = C;
			if(A==0&&B==0) {
				if(C==0)ot.println(-1);
				else ot.println(0);
			}else if(A==0) {
				ot.println(1);
				ot.println(-c/b);
			}else {
				if(B<0) {
					A *= -1;
					B *= -1;
					C *= -1;
					a *= -1;
					b *= -1;
					c *= -1;
				}
				long D = B*B-4*A*C;
				if(D<0) ot.println(0);
				else if(D==0) {
					ot.println(1);
					ot.println(-b/(2*a));
				}
				else {
					double ans1 = -(b+Math.sqrt(D))/(2*a);
					double ans2 = -(B*B-D)/(2*a*(b+Math.sqrt(D)));
					if(ans1>ans2) {
						double tmp = ans1;
						ans1 = ans2;
						ans2 = tmp;
					}
					ot.println(2);
					ot.println(ans1);
					ot.println(ans2);
				}
			}
		}
		ot.flush();
	
	}
}

class MLScanner {
	  private static final int BUFFER_SIZE = 1024;
	  
	  private final InputStream stream;
	  private final byte[] buffer;
	  private int pointer;
	  private int bufferLength;
	  
	  MLScanner(InputStream stream) {
	    this.stream = stream;
	    this.buffer = new byte[BUFFER_SIZE];
	    this.pointer = 0;
	    this.bufferLength = 0;
	  }
	  
	  private boolean hasNextByte() {
	    if (pointer < bufferLength) {
	      return true;
	    }
	    
	    pointer = 0;
	    try {
	      bufferLength = stream.read(buffer);
	    } catch (IOException e) {
	      throw new RuntimeException(e);
	    }
	    return bufferLength > 0;
	  }
	  
	  private int readByte() {
	    if (hasNextByte()) {
	      return buffer[pointer++];
	    } else {
	      return -1;
	    }
	  }
	  
	  private static boolean isPrintableChar(int c) {
	    return 33 <= c && c <= 126;
	  }
	  
	  public boolean hasNext() {
	    while (hasNextByte() && !isPrintableChar(buffer[pointer])) {
	      pointer++;
	    }
	    return hasNextByte();
	  }
	  
	  public String next() {
	    if (!hasNext()) {
	      throw new NoSuchElementException();
	    }
	    StringBuilder sb = new StringBuilder();
	    while(true) {
	      int b = readByte();
	      if (!isPrintableChar(b)) {
	        break;
	      }
	      sb.appendCodePoint(b);
	    }
	    return sb.toString();
	  }
	  
	  public char nextChar() {
	    return next().charAt(0);
	  }
	  
	  public int nextInt() {
	    long nl = nextLong();
	    if (nl < Integer.MIN_VALUE || Integer.MAX_VALUE < nl) {
	      throw new NumberFormatException();
	    }
	    return (int) nl;
	  }
	  
	  public long nextLong() {
	    if (!hasNext()) {
	      throw new NoSuchElementException();
	    }
	    
	    long n = 0;
	    boolean minus = false;
	    
	    {
	      int b = readByte();
	      if (b == '-') {
	        minus = true;
	      } else if ('0' <= b && b <= '9') {
	        n = b - '0';
	      } else {
	        throw new NumberFormatException();
	      }
	    }
	    
	    while(true){
	      int b = readByte();
	      if ('0' <= b && b <= '9') {
	        n *= 10;
	        n += b - '0';
	      } else if (b == -1 || !isPrintableChar(b)) {
	        return minus ? -n : n;
	      } else {
	        throw new NumberFormatException();
	      }
	    }
	  }
	  
	  public double nextDouble() {
	    return Double.parseDouble(next());
	  }
	  
	  public String[] next(int n) {
	    String[] array = new String[n];
	    for (int i = 0; i < n; i++) {
	      array[i] = next();
	    }
	    return array;
	  }
	  
	  public char[] nextChar(int n) {
	    char[] array = new char[n];
	    for (int i = 0; i < n; i++) {
	      array[i] = nextChar();
	    }
	    return array;
	  }
	  
	  public int[] nextInt(int n) {
	    int[] array = new int[n];
	    for (int i = 0; i < n; i++) {
	      array[i] = nextInt();
	    }
	    return array;
	  }
	  
	  public long[] nextLong(int n) {
	    long[] array = new long[n];
	    for (int i = 0; i < n; i++) {
	      array[i] = nextLong();
	    }
	    return array;
	  }
	  
	  public double[] nextDouble(int n) {
	    double[] array = new double[n];
	    for (int i = 0; i < n; i++) {
	      array[i] = nextDouble();
	    }
	    return array;
	  }
	  
	  public char[] nextCharArray() {
	    return next().toCharArray();
	  }
	  
	  public int[][] nextInt(int n, int m) {
	    int[][] matrix = new int[n][m];
	    for (int i = 0; i < n; i++) {
	      for (int j = 0; j < m; j++) {
	        matrix[i][j] = nextInt();
	      }
	    }
	    return matrix;
	  }
	  
	  public char[][] nextChar(int n, int m) {
	    char[][] matrix = new char[n][m];
	    for (int i = 0; i < n; i++) {
	      for (int j = 0; j < m; j++) {
	        matrix[i][j] = nextChar();
	      }
	    }
	    return matrix;
	  }
	  
	  public long[][] nextLong(int n, int m) {
	    long[][] matrix = new long[n][m];
	    for (int i = 0; i < n; i++) {
	      for (int j = 0; j < m; j++) {
	        matrix[i][j] = nextLong();
	      }
	    }
	    return matrix;
	  }
	  
	  public double[][] nextDouble(int n, int m) {
	    double[][] matrix = new double[n][m];
	    for (int i = 0; i < n; i++) {
	      for (int j = 0; j < m; j++) {
	        matrix[i][j] = nextDouble();
	      }
	    }
	    return matrix;
	  }
	  
	  public char[][] nextCharArray(int n) {
	    char[][] matrix = new char[n][];
	    for (int i = 0; i < n; i++) {
	      matrix[i] = next().toCharArray();
	    }
	    return matrix;
	  }
	}