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pairs.go
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/
pairs.go
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package main
import (
"bufio"
"fmt"
"os"
)
func pairs(k int, arr []int) int {
dict := make(map[int]bool)
var item int
for _, item = range arr {
dict[item] = true
}
var result int
for item = range dict {
if dict[item+k] {
result++
}
}
return result
}
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, k int
_, err = fmt.Fscan(reader, &n, &k)
checkError(err)
arr := make([]int, n)
for i := 0; i < n; i++ {
_, err = fmt.Fscan(reader, &arr[i])
checkError(err)
}
result := pairs(k, arr)
fmt.Fprint(writer, result)
writer.Flush()
}
func checkError(err error) {
if err != nil {
panic(err)
}
}