From 5907d7f7c870eb2ee0e0ec9d6818b30f0ca393f8 Mon Sep 17 00:00:00 2001
From: yenru0 <yenru0604@gmail.com>
Date: Mon, 7 Jul 2025 17:42:25 +0900
Subject: [PATCH] complete 13265.kt 21208.kt

---
 storage/zeta/kt/completed/13265.kt | 65 ++++++++++++++++++++++++++++++
 storage/zeta/kt/completed/21208.kt | 27 +++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 storage/zeta/kt/completed/13265.kt
 create mode 100644 storage/zeta/kt/completed/21208.kt

diff --git a/storage/zeta/kt/completed/13265.kt b/storage/zeta/kt/completed/13265.kt
new file mode 100644
index 0000000..d1e0f79
--- /dev/null
+++ b/storage/zeta/kt/completed/13265.kt
@@ -0,0 +1,65 @@
+fun canBipartitioned(n: Int, edges: List<List<Int>>): Boolean {
+    val colored = MutableList(n) { false }
+    val visited = MutableList(n) { false }
+
+    val deq = mutableListOf<Pair<Int, Boolean>>()
+
+    var deadFlag = false
+    (0 until n).forEach {
+        deq.add(Pair(it, true))
+    }
+
+    while (deq.isNotEmpty()) {
+        val (node, beforeColor) = deq.removeLast()
+        if (visited[node]) {
+            continue
+        }
+        visited[node] = true
+        val nowColor = !beforeColor
+        colored[node] = nowColor
+
+        for (next in edges[node]) {
+            if (visited[next] && colored[next] == nowColor) {
+                deadFlag = true
+                break
+            }
+
+            if (!visited[next]) {
+                deq.add(Pair(next, nowColor))
+            }
+        }
+
+        if (deadFlag) {
+            break
+        }
+    }
+
+    return !deadFlag
+}
+
+
+fun main() = with(System.`in`.bufferedReader()) {
+    (1..readln().toInt()).forEach { _ ->
+        val (n /* 동그라미 개수*/, m/* 직선 개수*/) = readln().split(' ').map { i -> i.toInt() }
+        val edges: List<List<Int>> = (1..m).map {
+            readln().split(' ').map { i -> i.toInt() }.let {
+                Pair(it[0] - 1, it[1] - 1)
+            }
+        }.let {
+            val res: MutableList<MutableList<Int>> = MutableList(n, { mutableListOf() })
+            it.forEach {
+                res[it.first].add(it.second)
+                res[it.second].add(it.first)
+            }
+            res
+        }
+
+        println(
+            if (canBipartitioned(n, edges)) {
+                "possible"
+            } else {
+                "impossible"
+            }
+        )
+    }
+}
\ No newline at end of file
diff --git a/storage/zeta/kt/completed/21208.kt b/storage/zeta/kt/completed/21208.kt
new file mode 100644
index 0000000..edb834e
--- /dev/null
+++ b/storage/zeta/kt/completed/21208.kt
@@ -0,0 +1,27 @@
+data class Record(
+    var counts: Int,
+    var lastModified: Int,
+)
+
+fun main() = with(System.`in`.bufferedReader()) {
+    val (n, k) = readln().split(' ').map { i -> i.toInt() }
+    val history = mutableMapOf<String, Record>()
+
+    (1..(3 * n)).forEach { i ->
+        val key = readln()
+
+        if (key in history) {
+            history[key]?.let {
+                it.counts++
+                it.lastModified = i
+            }
+        } else {
+            history[key] = Record(1, i)
+        }
+    }
+
+    history.toList().sortedWith(compareBy({ it.second.counts }, { it.second.lastModified })).takeLast(k).reversed()
+        .forEach { item ->
+            println(item.first)
+        }
+}
\ No newline at end of file