palindromeIndex.go

package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strconv"
	"strings"
)

/*
 * Complete the 'palindromeIndex' function below.
 *
 * The function is expected to return an INTEGER.
 * The function accepts STRING s as parameter.
 */

func palindromeIndex(s string) int32 {

	// Write your code here
	for i, _ := range s {
		if s[i] == s[(len(s)-1)-i] {
			continue
		} else if i == ((len(s) - 1) - i) {
			return -1
		} else {
			if s[i] == s[(len(s)-1)-(i+1)] {
				return int32((len(s) - 1) - i)
			} else {
				return int32(i - 1)
			}
		}
	}
	return -1
}

func main() {
	reader := bufio.NewReaderSize(os.Stdin, 16*1024*1024)

	stdout, err := os.Create(os.Getenv("OUTPUT_PATH"))
	checkError(err)

	defer stdout.Close()

	writer := bufio.NewWriterSize(stdout, 16*1024*1024)

	qTemp, err := strconv.ParseInt(strings.TrimSpace(readLine(reader)), 10, 64)
	checkError(err)
	q := int32(qTemp)

	for qItr := 0; qItr < int(q); qItr++ {
		s := readLine(reader)

		result := palindromeIndex(s)

		fmt.Fprintf(writer, "%d\n", result)
	}

	writer.Flush()
}

func readLine(reader *bufio.Reader) string {
	str, _, err := reader.ReadLine()
	if err == io.EOF {
		return ""
	}
	return strings.TrimRight(string(str), "\r\n")
}

func checkError(err error) {
	if err != nil {
		panic(err)
	}
}