[전현수] - 노드사이의 거리, 빗물, 벼락치기, 할인 행사

src/main/kotlin/hyunsoo/49week/노드사이의 거리.kt

@@ -0,0 +1,84 @@
+package hyunsoo.`49week`
+
+import java.util.*
+
+/**
+ *
+ * <문제>
+ * [노드사이의 거리](https://www.acmicpc.net/problem/1240)
+ *
+ * - 아이디어
+ *
+ * - 트러블 슈팅
+ *
+ */
+class `전현수_노드사이의_거리` {
+
+    private data class Bundle(val node: Int, val cost: Int)
+
+    private lateinit var treeInfo: Array<IntArray>
+
+    fun solution() {
+
+        val (nodeCnt, wantToKnowCnt) = readln().split(" ").map { it.toInt() }
+
+        treeInfo = Array(nodeCnt + 1) {
+            IntArray(nodeCnt + 1)
+        }
+
+        repeat(nodeCnt - 1) {
+            val (start, end, cost) = readln().split(" ").map { it.toInt() }
+            treeInfo[start][end] = cost
+            treeInfo[end][start] = cost
+        }
+
+        repeat(wantToKnowCnt) {
+
+            val (start, end) = readln().split(" ").map { it.toInt() }
+
+            val visited = BooleanArray(nodeCnt + 1)
+
+            val queue: Queue<Bundle> = LinkedList()
+
+            treeInfo[start].forEachIndexed { nodeIndex, cost ->
+
+                if (cost == NO_WAY) return@forEachIndexed
+
+                visited[nodeIndex] = true
+                queue.add(Bundle(nodeIndex, cost))
+
+            }
+
+            while (queue.isNotEmpty()) {
+
+                val (node, preCost) = queue.poll()
+
+                if (node == end) {
+                    println(preCost)
+                    return@repeat
+                }
+
+                treeInfo[node].forEachIndexed { nodeIndex, cost ->
+
+                    if (cost == NO_WAY) return@forEachIndexed
+
+                    if (visited[nodeIndex]) return@forEachIndexed
+
+                    visited[nodeIndex] = true
+                    queue.add(Bundle(nodeIndex, preCost + cost))
+
+                }
+
+            }
+
+        }
+    }
+
+    companion object {
+        const val NO_WAY = 0
+    }
+}
+
+fun main() {
+    전현수_노드사이의_거리().solution()
+}

src/main/kotlin/hyunsoo/49week/벼락치기.kt

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+package hyunsoo.`49week`
+
+import kotlin.math.max
+
+/**
+ *
+ * <문제>
+ * [벼락치기](https://www.acmicpc.net/problem/14728)
+ *
+ * - 아이디어
+ *
+ * - 트러블 슈팅
+ *
+ */
+class `전현수_벼락치기` {
+
+    private data class Question(val expectedTime: Int, val score: Int)
+
+    fun solution() {
+
+        val (unitCnt, totalTime) = readln().split(" ").map { it.toInt() }
+
+        val questionList = mutableListOf<Question>().apply {
+            add(Question(0, 0))
+        }
+
+        repeat(unitCnt) {
+
+            val (expectedTime, score) = readln().split(" ").map { it.toInt() }
+            questionList.add(Question(expectedTime, score))
+
+        }
+
+        val dp = Array(unitCnt + 1) {
+            IntArray(totalTime + 1)
+        }
+        for (i in 1..unitCnt) {
+            val curQuestion = questionList[i]
+            for (j in 0..totalTime) {
+                if (curQuestion.expectedTime <= j) {
+                    dp[i][j] = max(
+                        dp[i - 1][j],
+                        dp[i - 1][j - curQuestion.expectedTime] + curQuestion.score
+                    )
+                } else {
+                    dp[i][j] = dp[i - 1][j]
+                }
+            }
+        }
+
+        println(dp[unitCnt][totalTime])
+
+
+    }
+}
+
+fun main() {
+    전현수_벼락치기().solution()
+}

src/main/kotlin/hyunsoo/49week/빗물.kt

@@ -0,0 +1,41 @@
+package hyunsoo.`49week`
+
+import java.util.*
+import kotlin.math.min
+
+/**
+ *
+ * <문제>
+ * [빗물](https://www.acmicpc.net/problem/14719)
+ *
+ * - 아이디어
+ *
+ * - 트러블 슈팅
+ *
+ */
+class `전현수_빗물` {
+
+    fun solution() {
+
+        val (h, w) = readln().split(" ").map { it.toInt() }
+        val heightInfo = readln().split(" ").map { it.toInt() }
+        var amount = 0
+
+        for (i in 1 until w) {
+
+            val leftMax = heightInfo.subList(i, heightInfo.size).maxOf { it }
+            val rightMax = heightInfo.subList(0, i + 1).maxOf { it }
+
+            val minHeight = min(leftMax, rightMax)
+
+            if (heightInfo[i] < minHeight) amount += minHeight - heightInfo[i]
+        }
+
+
+        println(amount)
+    }
+}
+
+fun main() {
+    전현수_빗물().solution()
+}

src/main/kotlin/hyunsoo/49week/할인 행사.kt

@@ -0,0 +1,63 @@
+package hyunsoo.`49week`
+
+/**
+ *
+ * <문제>
+ * [할인 행사](https://school.programmers.co.kr/learn/courses/30/lessons/131127)
+ *
+ * - 아이디어
+ *
+ * - 트러블 슈팅
+ *
+ */
+class `전현수_할인_행사` {
+
+    fun solution(want: Array<String>, number: IntArray, discount: Array<String>): Int {
+
+        var answer = 0
+
+        for (i in 0 .. discount.size - 10) {
+
+            val wishList = mutableMapOf<String, Int>()
+
+            want.forEachIndexed { index, item ->
+                wishList[item] = number[index]
+            }
+
+            repeat(10) {
+                val index = i + it
+                wishList[discount[index]]?.let { pre ->
+                    wishList[discount[index]] = pre - 1
+                }
+            }
+            if (wishList.values.all { it <= 0 }) answer += 1
+        }
+
+        return answer
+    }
+}
+
+fun main() {
+    전현수_할인_행사().solution(
+        arrayOf("banana", "apple", "rice", "pork", "pot"),
+        intArrayOf(3, 2, 2, 2, 1),
+        arrayOf(
+            "chicken",
+            "apple",
+            "apple",
+            "banana",
+            "rice",
+            "apple",
+            "pork",
+            "banana",
+            "pork",
+            "rice",
+            "pot",
+            "banana",
+            "apple",
+            "banana"
+        )
+    ).apply {
+        println(this)
+    }
+}