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minimum_swaps.go
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/
minimum_swaps.go
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package main
import (
"bufio"
"fmt"
"os"
"sort"
)
type pair struct {
index int
value int
}
func minimumSwaps(arr []int) int {
var i, j int
arrayPosition := make([]pair, len(arr))
for i = range arr {
arrayPosition[i].index = i
arrayPosition[i].value = arr[i]
}
sort.Slice(arrayPosition, func(i, j int) bool {
return arrayPosition[i].value < arrayPosition[j].value
})
visited := make([]bool, len(arr))
var swaps int
for i = range visited {
if visited[i] || arrayPosition[i].index == i {
continue
}
var cycle int
for j = i; !visited[j]; cycle++ {
visited[j] = true
j = arrayPosition[j].index
}
if cycle > 0 {
swaps += cycle - 1
}
}
return swaps
}
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)
}
result := minimumSwaps(arr)
fmt.Fprint(writer, result)
writer.Flush()
}
func checkError(err error) {
if err != nil {
panic(err)
}
}