diff --git a/storage/zeta/kt/completed/25331.kt b/storage/zeta/kt/completed/25331.kt
new file mode 100644
index 0000000..41581aa
--- /dev/null
+++ b/storage/zeta/kt/completed/25331.kt
@@ -0,0 +1,166 @@
+import java.io.StreamTokenizer
+import kotlin.math.min
+
+const val SIDE = 7
+const val SIZE = SIDE * SIDE
+
+class Drop7Simulator(val initState: IntArray) {
+    var state: IntArray = initState.clone()
+
+    fun init() {
+        state = initState.clone()
+    }
+
+    fun getPos(row: Int, col: Int): Int = row * SIDE + col
+    fun getRC(pos: Int) = Pair(pos / SIDE, pos % SIDE)
+
+    fun getAt(pos: Int) = state[pos]
+    fun getAt(row: Int, col: Int): Int = state[row * SIDE + col]
+    fun setAt(row: Int, col: Int, value: Int) {
+        state[row * SIDE + col] = value
+    }
+
+    fun swapAt(r1: Int, c1: Int, r2: Int, c2: Int) {
+        val v1 = getAt(r1, c1)
+        setAt(r1, c1, getAt(r2, c2))
+        setAt(r2, c2, v1)
+    }
+
+    fun countBalls(): Int {
+        return state.count {
+            it != 0
+        }
+    }
+
+    fun print() {
+        for (i in 0 until SIDE) {
+            for (j in 0 until SIDE) {
+                print(getAt(i, j))
+                print(" ")
+            }
+            println()
+        }
+    }
+
+    fun start(ball: Int): Int {
+        var minimum = Integer.MAX_VALUE
+        for (j in 0 until SIDE) {
+            if (getAt(0, j) != 0) {
+                continue
+            }
+            init()
+            var falling = SIDE - 1
+            for (i in 1 until SIDE) {
+                if (getAt(i, j) != 0) {
+                    falling = i - 1
+                    break
+                }
+            }
+            setAt(falling, j, ball)
+
+            while (update());
+            minimum = min(minimum, countBalls())
+        }
+
+        return minimum
+    }
+
+    fun update(): Boolean {
+        // 삭제 작업
+        val candidate = mutableListOf<Int>() // List<Pos>
+        val groups = mutableListOf<Pair<Int, Int>>() //
+        for (i in 0 until SIDE) {
+            for (j in 0 until SIDE) {
+                val pos = getPos(i, j)
+                val ele = getAt(pos)
+
+                if (ele == 0) {
+                    groups.filter {
+                        it.first == groups.size
+                    }.forEach {
+                        candidate.add(it.second)
+                    }
+
+                    groups.clear()
+                } else {
+                    groups.add(Pair(ele, pos))
+                }
+            }
+            groups.filter {
+                it.first == groups.size
+            }.forEach {
+                candidate.add(it.second)
+            }
+            groups.clear()
+
+        }
+
+        for (j in 0 until SIDE) {
+            for (i in 0 until SIDE) {
+                val pos = getPos(i, j)
+                val ele = getAt(pos)
+
+                if (ele == 0) {
+                    groups.filter {
+                        it.first == groups.size
+                    }.forEach {
+                        candidate.add(it.second)
+                    }
+
+                    groups.clear()
+                } else {
+                    groups.add(Pair(ele, pos))
+                }
+            }
+
+            groups.filter {
+                it.first == groups.size
+            }.forEach {
+                candidate.add(it.second)
+            }
+            groups.clear()
+        }
+
+
+        if (candidate.isEmpty()) {
+            return false
+        }
+
+        candidate.forEach {
+            state[it] = 0
+        }
+
+        // 중력 업데이트
+
+        for (j in 0 until SIDE) {
+            for (i in (0 until SIDE - 1).reversed()) {
+                var now = i
+                if (getAt(now, j) == 0) {
+                    continue
+                }
+                while (now < SIDE - 1 && getAt(now + 1, j) == 0) {
+                    swapAt(now, j, now + 1, j)
+                    now++
+                }
+            }
+        }
+        return true
+    }
+}
+
+
+fun main() = with(StreamTokenizer(System.`in`.bufferedReader())) {
+    val state = IntArray(SIZE)
+
+    for (i in 0 until SIZE) {
+        nextToken()
+        state[i] = nval.toInt()
+    }
+
+    val simulator = Drop7Simulator(state)
+
+    nextToken()
+    val ball = nval.toInt()
+
+    println(simulator.start(ball))
+}
\ No newline at end of file
diff --git a/storage/zeta/kt/completed/32189.kt b/storage/zeta/kt/completed/32189.kt
new file mode 100644
index 0000000..e33bd2e
--- /dev/null
+++ b/storage/zeta/kt/completed/32189.kt
@@ -0,0 +1,61 @@
+import kotlin.math.max
+import kotlin.math.min
+
+fun maxSplitDiscordance(s: String): Int {
+    val n = s.length
+    val dp = IntArray((n + 1) * (n + 1))
+
+    fun getLCS(i: Int, j: Int): Int { // where i and j means string index
+        return dp[(i + 1) * (n + 1) + (j + 1)]
+    }
+
+    fun setLCS(i: Int, j: Int, v: Int): Int {
+        dp[(i + 1) * (n + 1) + (j + 1)] = v
+        return v
+    }
+
+    var maxDiscordance = 0
+    var lcs: Int
+    val candidate = if (n % 2 == 0) {
+        listOf(n / 2)
+    } else {
+        listOf(n / 2, n / 2 + 1)
+    }
+    for (splitLoc in candidate) {
+        lcs = 0
+        for (x in 0 until splitLoc) {
+            setLCS(x, splitLoc - 1, 0)
+        }
+
+
+        for (i in 0 until splitLoc) {
+            for (j in splitLoc until n) {
+
+                if (s[i] == s[j]) {
+                    lcs = max(setLCS(i, j, getLCS(i - 1, j - 1) + 1), lcs)
+                } else {
+                    lcs = max(
+                        setLCS(
+                            i, j, max(
+                                getLCS(i, j - 1),
+                                getLCS(i - 1, j)
+                            )
+                        ),
+                        lcs
+                    )
+                }
+            }
+        }
+
+        maxDiscordance = max(maxDiscordance, min(splitLoc, n - splitLoc) - lcs)
+    }
+
+    return maxDiscordance
+
+}
+
+fun main() {
+    val s = readln()
+
+    println(maxSplitDiscordance(s))
+}
\ No newline at end of file
diff --git a/storage/zeta/kt/completed/9655.kt b/storage/zeta/kt/completed/9655.kt
new file mode 100644
index 0000000..1b1dd17
--- /dev/null
+++ b/storage/zeta/kt/completed/9655.kt
@@ -0,0 +1,17 @@
+fun canWin(n: Int): Boolean {
+    return n % 2 != 0
+}
+
+fun main() = with(System.`in`.bufferedReader()) {
+    val n = this.readLine().toInt()
+
+    System.out.bufferedWriter().use {
+        it.write(
+            if (canWin(n)) {
+                "SK"
+            } else {
+                "CY"
+            }
+        )
+    }
+}
\ No newline at end of file