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binary_search_algorithm.go
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/
binary_search_algorithm.go
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package main
import (
"bufio"
"fmt"
"os"
"sort"
)
func binarySearchAlgorithm(arr []int, x int) int {
i := sort.Search(len(arr), func(i int) bool { return arr[i] >= x })
if i < len(arr) && arr[i] == x {
return i + 1
}
return -1
}
func main() {
stdin, err := os.Open(os.Getenv("INPUT_PATH"))
if err != nil {
stdin = os.Stdin
}
defer stdin.Close()
stdout, err := os.Create(os.Getenv("OUTPUT_PATH"))
if err != nil {
stdout = os.Stdout
}
defer stdout.Close()
reader := bufio.NewReaderSize(stdin, 1024*1024)
writer := bufio.NewWriterSize(stdout, 1024*1024)
var n int
_, err = fmt.Fscan(reader, &n)
checkError(err)
arr := make([]int, n)
for i := 0; i < n; i++ {
_, err = fmt.Fscan(reader, &arr[i])
checkError(err)
}
var k, x int
_, err = fmt.Fscan(reader, &k)
checkError(err)
for i := 0; i < k; i++ {
_, err = fmt.Fscan(reader, &x)
checkError(err)
result := binarySearchAlgorithm(arr, x)
fmt.Fprintf(writer, "%d ", result)
}
writer.Flush()
}
func checkError(err error) {
if err != nil {
panic(err)
}
}