結果

問題 No.955 ax^2+bx+c=0
ユーザー ccppjsrb
提出日時 2020-08-24 23:22:53
言語 Go
(1.23.4)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 2,559 bytes
コンパイル時間 12,487 ms
コンパイル使用メモリ 227,260 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-11-06 10:53:23
合計ジャッジ時間 15,416 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 122
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ソースコード

diff # 

package main

import (
	"bufio"
	"fmt"
	"math/big"
	"os"
	"strconv"
)

func configure(scanner *bufio.Scanner) {
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	a := getNextInt64(scanner)
	b := getNextInt64(scanner)
	c := getNextInt64(scanner)
	if a == 0 {
		if b == 0 {
			if c == 0 {
				fmt.Fprintln(writer, -1)
				return
			}
			fmt.Fprintln(writer, 0)
			return
		}
		fmt.Fprintln(writer, 1)
		f := big.NewFloat(-float64(c))
		ff := big.NewFloat(1 / float64(b))
		fmt.Fprintln(writer, f.Mul(f, ff))
		return
	}
	if b*b < 4*a*c {
		fmt.Fprintln(writer, 0)
		return
	}
	if b*b == 4*a*c {
		fmt.Fprintln(writer, 1)
		f := big.NewFloat(-float64(b))
		ff := big.NewFloat(1 / float64(a<<1))
		fmt.Fprintln(writer, f.Mul(f, ff))
		return
	}
	fmt.Fprintln(writer, 2)
	f := big.NewFloat(-float64(b))
	f.SetPrec(512)
	ff := big.NewFloat(float64(b))
	ff.SetPrec(512)
	ff.Mul(ff, big.NewFloat(float64(b)))
	ff2 := big.NewFloat(4)
	ff2.SetPrec(512)
	ff2.Mul(ff2, big.NewFloat(float64(a)))
	ff2.Mul(ff2, big.NewFloat(float64(c)))
	ff.Sub(ff, ff2)
	ff = ff.Sqrt(ff)
	fff := big.NewFloat(1 / float64(a))
	fff.SetPrec(512)
	fff.Mul(fff, big.NewFloat(0.5))
	if a < 0 {
		fmt.Fprintln(writer, f.Add(f, ff).Mul(f, fff).Text('f', 15))
		f.Set(big.NewFloat(-float64(b)))
		fmt.Fprintln(writer, f.Sub(f, ff).Mul(f, fff).Text('f', 15))
		return
	}
	fmt.Fprintln(writer, f.Sub(f, ff).Mul(f, fff).Text('f', 15))
	f.Set(big.NewFloat(-float64(b)))
	fmt.Fprintln(writer, f.Add(f, ff).Mul(f, fff).Text('f', 15))
}
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