[전현수] - 알고스팟, A와 B 2, 입국심사, 회장뽑기

src/main/kotlin/hyunsoo/47week/A와 B 2.kt

@@ -0,0 +1,51 @@
+package hyunsoo.`47week`
+
+import kotlin.system.exitProcess
+
+/**
+ *
+ * <문제>
+ * [A와 B 2](https://www.acmicpc.net/problem/12919)
+ *
+ * - 아이디어
+ *
+ * - 트러블 슈팅
+ *
+ */
+class `전현수_A와_B_2` {
+
+    fun solution() {
+
+        val s = readln()
+        val t = readln()
+
+        find(s, t)
+
+        println(0)
+    }
+
+    fun find(s: String, t: String) {
+
+        if (s.length == t.length) {
+
+            if (s == t) {
+                println(1)
+                exitProcess(0)
+            }
+
+            return
+        }
+
+        if (t.last() == 'A') {
+            find(s, t.substring(0, t.lastIndex))
+        }
+        if (t.first() == 'B') {
+            find(s, t.substring(1, t.lastIndex + 1).reversed())
+        }
+
+    }
+}
+
+fun main() {
+    전현수_A와_B_2().solution()
+}

src/main/kotlin/hyunsoo/47week/알고스팟.kt

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+package hyunsoo.`47week`
+
+/**
+ *
+ * <문제>
+ * [알고스팟](https://www.acmicpc.net/problem/1261)
+ *
+ * - 아이디어
+ *
+ * - 트러블 슈팅
+ *
+ */
+class `전현수_알고스팟` {
+
+    private data class Position(val x: Int, val y: Int)
+
+    private data class Bundle(val pos: Position, val cost: Int) {
+        constructor(x: Int, y: Int, cost: Int) : this(Position(x, y), cost)
+    }
+
+    private val dirs = listOf(
+        Position(1, 0),
+        Position(0, 1),
+        Position(-1, 0),
+        Position(0, -1),
+    )
+
+    fun solution() {
+
+        val deque = ArrayDeque<Bundle>()
+
+        val (width, height) = readln().split(" ").map { it.toInt() }
+
+        val map = Array(height) {
+            readln().chunked(1).map {
+                if (it == "1") WALL else it.toInt()
+            }.toIntArray()
+
+        }
+
+        val visited = Array(height) {
+            BooleanArray(width)
+        }
+
+        deque.add(Bundle(0, 0, 0))
+        visited[0][0] = true
+
+        while (deque.isNotEmpty()) {
+
+            val (pos, cost) = deque.removeFirst()
+
+            map[pos.x][pos.y] = cost
+            dirs.forEach { dir ->
+
+                val nx = pos.x + dir.x
+                val ny = pos.y + dir.y
+
+                if (nx !in 0 until height ||
+                    ny !in 0 until width ||
+                    visited[nx][ny]
+                ) return@forEach
+
+                visited[nx][ny] = true
+
+                when (map[nx][ny]) {
+                    WALL -> {
+                        deque.addLast(Bundle(nx, ny, cost + 1))
+                    }
+
+                    EMPTY -> {
+                        deque.addFirst(Bundle(nx, ny, cost))
+                    }
+                }
+            }
+
+        }
+
+        println(map[height - 1][width - 1])
+    }
+
+    companion object {
+        const val EMPTY = 0
+        const val WALL = -1
+    }
+}
+
+fun main() {
+    전현수_알고스팟().solution()
+}

src/main/kotlin/hyunsoo/47week/입국심사.kt

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+package hyunsoo.`47week`
+
+/**
+ *
+ * <문제>
+ * [입국심사](https://school.programmers.co.kr/learn/courses/30/lessons/43238)
+ *
+ * - 아이디어
+ *
+ * - 트러블 슈팅
+ *
+ */
+class `전현수_입국심사` {
+
+    fun solution(n: Int, times: IntArray): Long {
+
+        val sortedTimes = times.sortedBy { it }
+
+        var answer: Long = 0
+
+        var left = sortedTimes.first().toLong()
+        var right = sortedTimes.last().toLong() * n
+
+        while (left <= right) {
+
+            val mid = (left + right) / 2
+            var people: Long = 0
+
+            sortedTimes.forEach { time ->
+                people += mid / time
+            }
+
+            if (n <= people) {
+                answer = mid
+                right = mid - 1
+            } else {
+                left = mid + 1
+            }
+
+        }
+
+        return answer
+    }
+}
+
+fun main() {
+    전현수_입국심사()
+        .solution(6, intArrayOf(7, 10))
+        .apply {
+            println(this)
+        }
+}

src/main/kotlin/hyunsoo/47week/회장뽑기.kt

@@ -0,0 +1,82 @@
+package hyunsoo.`47week`
+
+import java.util.*
+
+/**
+ *
+ * <문제>
+ * [회장뽑기](https://www.acmicpc.net/problem/2660)
+ *
+ * - 아이디어
+ *
+ * - 트러블 슈팅
+ *
+ */
+class `전현수_회장뽑기` {
+
+    fun solution() {
+
+        val peopleCnt = readln().toInt()
+
+        val graph = Array(peopleCnt + 1) {
+            mutableListOf<Int>()
+        }
+
+        val scoreList = IntArray(peopleCnt + 1)
+
+        while (true) {
+
+            val (a, b) = readln().split(" ").map { it.toInt() }
+            if (a == -1 && b == -1) break
+
+            graph[a].add(b)
+            graph[b].add(a)
+
+        }
+
+        for (myIndex in 1..peopleCnt) {
+            val visited = BooleanArray(peopleCnt + 1).apply {
+                this[0] = true
+                this[myIndex] = true
+            }
+            val queue: Queue<Pair<Int, Int>> = LinkedList()
+
+            queue.addAll(graph[myIndex] to 1)
+
+
+            while (queue.isNotEmpty()) {
+
+                val (friendIndex, cost) = queue.poll()
+
+                if (visited[friendIndex]) continue
+
+                scoreList[myIndex] = cost
+                visited[friendIndex] = true
+
+                queue.addAll(
+                    graph[friendIndex].filter { visited[it].not() } as MutableList to cost + 1)
+
+            }
+        }
+
+        val candidateScore = scoreList.drop(1).minOf { it }
+        println("$candidateScore ${scoreList.count { it == candidateScore }}")
+        scoreList.forEachIndexed { index, score ->
+            if (score == candidateScore) print("$index ")
+        }
+
+    }
+
+    private fun Queue<Pair<Int, Int>>.addAll(
+        pairElement: Pair<MutableList<Int>, Int>,
+    ) {
+        pairElement.first.forEach {
+            this.add(it to pairElement.second)
+        }
+    }
+
+}
+
+fun main() {
+    전현수_회장뽑기().solution()
+}