結果
| 問題 |
No.1639 最小通信路
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-06-25 02:18:36 |
| 言語 | Kotlin (2.1.0) |
| 結果 |
AC
|
| 実行時間 | 576 ms / 2,000 ms |
| コード長 | 2,979 bytes |
| コンパイル時間 | 14,820 ms |
| コンパイル使用メモリ | 450,256 KB |
| 実行使用メモリ | 63,888 KB |
| 最終ジャッジ日時 | 2024-09-17 00:56:19 |
| 合計ジャッジ時間 | 29,206 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 43 |
ソースコード
import java.io.PrintWriter
import java.lang.Exception
import java.util.*
fun PrintWriter.solve() {
val n = nextInt()
val m = n * (n - 1) / 2
if (n !in 2..100) {
throw Exception("2<=n<=100")
}
val a = Array(m) { 0 }
val b = Array(m) { 0 }
val c = Array(m) { 0.toBigInteger() }
for (i in 0 until m) {
val x = nextInt()
val y = nextInt()
if (x !in 1..n) {
throw Exception("1<=a[i]<=n")
}
if (y !in 1..n) {
throw Exception("1<=b[i]<=n")
}
val z = next()
a[i] = x - 1
b[i] = y - 1
c[i] = z.toBigInteger()
if (c[i] !in 1.toBigInteger().."10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000".toBigInteger()
) {
throw Exception("1<=c[i]<=10^100")
}
if (a[i] == b[i]) {
throw Exception("a[i]!=b[i]")
}
}
for (i in 1 until m) {
if (c[i - 1] >= c[i]) {
throw Exception("c[i-1]<c[i]")
}
}
for (i in 0 until m) {
for (j in 0 until i) {
if (a[i] == a[j] && b[i] == b[j]) {
throw Exception("(a[i],b[i]) distinct")
}
if (a[i] == b[j] && a[j] == b[i]) {
throw Exception("(a[i],b[i]) distinct")
}
}
}
val uf = UnionFind(n)
for (i in 0 until m) {
uf.unite(a[i], b[i])
if (uf.size(0) == n) {
println(c[i])
return
}
}
}
class UnionFind(n: Int) {
private val rank = IntArray(n) { 0 }
private val parent = IntArray(n) { -1 }
fun find(x: Int): Int {
if (parent[x] < 0) {
return x
}
parent[x] = find(parent[x])
return parent[x]
}
fun unite(x: Int, y: Int) {
val x1 = find(x)
val y1 = find(y)
if (x1 == y1) {
return
}
if (rank[x1] < rank[y1]) {
parent[y1] += parent[x1]
parent[x1] = y1
} else {
parent[x1] += parent[y1]
parent[y1] = x1
if (rank[x1] == rank[y1]) {
rank[x1]++
}
}
}
fun same(x: Int, y: Int): Boolean {
return find(x) == find(y)
}
fun size(x: Int): Int {
return -parent[find(x)]
}
}
fun main() {
val writer = PrintWriter(System.out, false)
writer.solve()
writer.flush()
}
// region Scanner
private var st = StringTokenizer("")
private val br = System.`in`.bufferedReader()
fun next(): String {
while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())
return st.nextToken()
}
fun nextInt() = next().toInt()
fun nextLong() = next().toLong()
fun nextLine() = br.readLine()
fun nextDouble() = next().toDouble()
// endregion