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1515D.go
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1515D.go
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package main
import (
"bufio"
. "fmt"
"io"
)
// github.com/EndlessCheng/codeforces-go
func CF1515D(_r io.Reader, _w io.Writer) {
in := bufio.NewReader(_r)
out := bufio.NewWriter(_w)
defer out.Flush()
abs := func(x int) int {
if x < 0 {
return -x
}
return x
}
var T, n, l, r, v int
for Fscan(in, &T); T > 0; T-- {
Fscan(in, &n, &l, &r)
c := make([]int, n+1)
for i := 0; i < l; i++ {
Fscan(in, &v)
c[v]++
}
for i := 0; i < r; i++ {
Fscan(in, &v)
c[v]--
}
ans := 0
for i := 1; i <= n; i++ {
for l > r && c[i] > 1 { // 左袜子多,且有相同颜色,左变右,与自己匹配
l -= 2
c[i] -= 2
ans++
}
for l < r && c[i] < -1 { // 右袜子多,且有相同颜色,右变左,与自己匹配
r -= 2
c[i] += 2
ans++
}
}
ans += abs(l-r) / 2 // 左变右或右变左
left := 0
for _, c := range c {
left += abs(c) // 变更颜色
}
Fprintln(out, ans+left/2) // 每次变更颜色都会配对两只袜子,所以要除以 2
}
}
//func main() { CF1515D(os.Stdin, os.Stdout) }