[소병희] - 내리막 길, 치즈, 가장 긴 증가하는 부분 수열 4, 삼각 달팽이

src/main/kotlin/byeonghee/week64/가장 긴 증가하는 부분 수열 4.kt

@@ -0,0 +1,35 @@
+package byeonghee.week64
+
+class `소병희_가장 긴 증가하는 부분 수열 4` {
+    companion object {
+        fun solve() = with(System.`in`.bufferedReader()) {
+            val n = readLine().toInt()
+            val arr = IntArray(n)
+            val dp = Array(n) { mutableListOf<Int>() }
+            var answer = 0
+
+            readLine().split(" ").forEachIndexed { i, v -> arr[i] = v.toInt() }
+
+            dp[0].add(arr[0])
+            for(i in 1 until n) {
+                var idx = i
+                for(j in i - 1 downTo 0) {
+                    if (dp[j].last() < arr[i] && dp[j].size > dp[idx].size) {
+                        idx = j
+                    }
+                }
+                if (idx != i) dp[i].addAll(dp[idx])
+                dp[i].add(arr[i])
+
+                if (dp[i].size > dp[answer].size) answer = i
+            }
+
+            println(dp[answer].size)
+            println(dp[answer].joinToString(" "))
+        }
+    }
+}
+
+fun main() {
+    `소병희_가장 긴 증가하는 부분 수열 4`.solve()
+}

src/main/kotlin/byeonghee/week64/내리막 길.kt

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+package byeonghee.week64
+
+class 소병희_내리막길 {
+    companion object {
+        val dr = intArrayOf(0, 1, 0, -1)
+        val dc = intArrayOf(1, 0, -1, 0)
+
+        fun solve() = with(System.`in`.bufferedReader()) {
+            val (m, n) = readLine().split(" ").map { it.toInt() }
+            val map = Array(m) { IntArray(n) }
+            val visited = Array(m) { IntArray(n) { -1 } }
+
+            repeat(m) { i ->
+                readLine().split(" ").forEachIndexed { j, v ->
+                    map[i][j] = v.toInt()
+                }
+            }
+
+            visited[m-1][n-1] = 1
+
+            fun dfs(r: Int, c: Int): Int {
+                if (visited[r][c] > -1) return visited[r][c]
+
+                visited[r][c] = 0
+                for(d in 0 until 4) {
+                    val nr = r + dr[d]
+                    val nc = c + dc[d]
+                    if (nr !in 0 until m || nc !in 0 until n) continue
+                    if (map[nr][nc] >= map[r][c]) continue
+
+                    visited[r][c] += dfs(nr, nc)
+                }
+
+                return visited[r][c]
+            }
+
+            println(dfs(0, 0))
+        }
+    }
+}
+
+fun main() {
+    소병희_내리막길.solve()
+}

src/main/kotlin/byeonghee/week64/삼각 달팽이.kt

@@ -0,0 +1,41 @@
+package byeonghee.week64
+
+class `소병희_삼각 달팽이` {
+    fun solution(n: Int): IntArray {
+        var answer: IntArray = intArrayOf()
+
+        val triangle = Array(n) { ArrayDeque<Int>() }
+        var side = n
+        var round = 0
+        var sl = 0
+        var count = 1
+
+        while(side > 0) {
+            for(i in sl until sl + side) {
+                triangle[i].add(round, count++)
+            }
+
+            repeat(side - 1) { i ->
+                triangle[sl + side - 1].add(round + i + 1, count++)
+            }
+
+            for(i in sl + side-2 downTo sl + 1) {
+                triangle[i].add(triangle[i].size - round, count++)
+            }
+
+            round++
+            side -= 3
+            sl += 2
+        }
+
+        return triangle.flatMap { it.toList() }.toIntArray()
+    }
+}
+
+fun main() {
+    val sol = `소병희_삼각 달팽이`()
+    println(sol.solution(4).joinToString(" "))
+    println(sol.solution(5).joinToString(" "))
+    println(sol.solution(6).joinToString(" "))
+    println(sol.solution(7).joinToString(" "))
+}

src/main/kotlin/byeonghee/week64/치즈.kt

@@ -0,0 +1,60 @@
+package byeonghee.week64
+
+class 소병희_치즈 {
+    companion object {
+        val dr = intArrayOf(0, 1, 0, -1)
+        val dc = intArrayOf(1, 0, -1, 0)
+
+        fun solve() = with(System.`in`.bufferedReader()) {
+            val (n, m) = readLine().split(" ").map { it.toInt() }
+            val paper = Array(n) { IntArray(m) }
+            var airContact = Array(n) { IntArray(m) }
+            val q = ArrayDeque<IntArray>()
+            var time = 0
+            var cheese = 0
+
+            repeat(n) { i ->
+                readLine().split(" ").forEachIndexed { j, v ->
+                    paper[i][j] = v.toInt().also { if (it == 1) cheese++ }
+                }
+            }
+
+            fun checkAir() {
+                airContact = Array(n) { IntArray(m) }
+                airContact[0][0]++
+                q.add(intArrayOf(0, 0))
+
+                while(q.isNotEmpty()) {
+                    val (r, c) = q.removeFirst()
+                    for(d in 0 until 4) {
+                        val nr = r + dr[d]
+                        val nc = c + dc[d]
+                        if (nr !in 0 until n || nc !in 0 until m) continue
+                        if (paper[nr][nc] == 0 && airContact[nr][nc] > 0) continue
+
+                        airContact[nr][nc]++
+                        if (paper[nr][nc] == 1) continue
+                        q.add(intArrayOf(nr, nc))
+                    }
+                }
+            }
+
+            while(cheese > 0) {
+                checkAir()
+                for(i in 0 until n) for(j in 0 until m) {
+                    if (paper[i][j] == 1 && airContact[i][j] >= 2) {
+                        paper[i][j] = 0
+                        cheese--
+                    }
+                }
+                time++
+            }
+
+            println(time)
+        }
+    }
+}
+
+fun main() {
+    소병희_치즈.solve()
+}