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hackerland.go
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/
hackerland.go
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package main
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
)
// Complete the viralAdvertising function below.
func viralAdvertising(n int32) int32 {
var liked, shared, cummulative int32
liked = 2
shared = 5
cummulative = 2
var i int32
for i = 2; i <= n+1; i++ {
shared = liked * 3
liked = shared / 2
cummulative = cummulative + liked
}
return cummulative
}
func main() {
reader := bufio.NewReaderSize(os.Stdin, 1024*1024)
stdout, err := os.Create(os.Getenv("OUTPUT_PATH"))
checkError(err)
defer stdout.Close()
writer := bufio.NewWriterSize(stdout, 1024*1024)
nTemp, err := strconv.ParseInt(readLine(reader), 10, 64)
checkError(err)
n := int32(nTemp)
result := viralAdvertising(n)
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)
}
}