diff --git a/src/main/kotlin/g3201_3300/s3264_final_array_state_after_k_multiplication_operations_i/Solution.kt b/src/main/kotlin/g3201_3300/s3264_final_array_state_after_k_multiplication_operations_i/Solution.kt
new file mode 100644
index 00000000..8124904b
--- /dev/null
+++ b/src/main/kotlin/g3201_3300/s3264_final_array_state_after_k_multiplication_operations_i/Solution.kt
@@ -0,0 +1,22 @@
+package g3201_3300.s3264_final_array_state_after_k_multiplication_operations_i
+
+// #Easy #2024_08_28_Time_226_ms_(68.00%)_Space_38.5_MB_(66.00%)
+
+@Suppress("NAME_SHADOWING")
+class Solution {
+    fun getFinalState(nums: IntArray, k: Int, multiplier: Int): IntArray {
+        var k = k
+        while (k-- > 0) {
+            var min = nums[0]
+            var index = 0
+            for (i in nums.indices) {
+                if (min > nums[i]) {
+                    min = nums[i]
+                    index = i
+                }
+            }
+            nums[index] = nums[index] * multiplier
+        }
+        return nums
+    }
+}
diff --git a/src/main/kotlin/g3201_3300/s3264_final_array_state_after_k_multiplication_operations_i/readme.md b/src/main/kotlin/g3201_3300/s3264_final_array_state_after_k_multiplication_operations_i/readme.md
new file mode 100644
index 00000000..70d68467
--- /dev/null
+++ b/src/main/kotlin/g3201_3300/s3264_final_array_state_after_k_multiplication_operations_i/readme.md
@@ -0,0 +1,49 @@
+3264\. Final Array State After K Multiplication Operations I
+
+Easy
+
+You are given an integer array `nums`, an integer `k`, and an integer `multiplier`.
+
+You need to perform `k` operations on `nums`. In each operation:
+
+*   Find the **minimum** value `x` in `nums`. If there are multiple occurrences of the minimum value, select the one that appears **first**.
+*   Replace the selected minimum value `x` with `x * multiplier`.
+
+Return an integer array denoting the _final state_ of `nums` after performing all `k` operations.
+
+**Example 1:**
+
+**Input:** nums = [2,1,3,5,6], k = 5, multiplier = 2
+
+**Output:** [8,4,6,5,6]
+
+**Explanation:**
+
+| Operation           | Result           |
+|---------------------|------------------|
+| After operation 1   | [2, 2, 3, 5, 6]  |
+| After operation 2   | [4, 2, 3, 5, 6]  |
+| After operation 3   | [4, 4, 3, 5, 6]  |
+| After operation 4   | [4, 4, 6, 5, 6]  |
+| After operation 5   | [8, 4, 6, 5, 6]  |
+
+**Example 2:**
+
+**Input:** nums = [1,2], k = 3, multiplier = 4
+
+**Output:** [16,8]
+
+**Explanation:**
+
+| Operation           | Result      |
+|---------------------|-------------|
+| After operation 1   | [4, 2]      |
+| After operation 2   | [4, 8]      |
+| After operation 3   | [16, 8]     |
+
+**Constraints:**
+
+*   `1 <= nums.length <= 100`
+*   `1 <= nums[i] <= 100`
+*   `1 <= k <= 10`
+*   `1 <= multiplier <= 5`
\ No newline at end of file
diff --git a/src/main/kotlin/g3201_3300/s3265_count_almost_equal_pairs_i/Solution.kt b/src/main/kotlin/g3201_3300/s3265_count_almost_equal_pairs_i/Solution.kt
new file mode 100644
index 00000000..c71e5009
--- /dev/null
+++ b/src/main/kotlin/g3201_3300/s3265_count_almost_equal_pairs_i/Solution.kt
@@ -0,0 +1,50 @@
+package g3201_3300.s3265_count_almost_equal_pairs_i
+
+// #Medium #2024_08_28_Time_188_ms_(100.00%)_Space_37.5_MB_(100.00%)
+
+@Suppress("NAME_SHADOWING")
+class Solution {
+    fun countPairs(nums: IntArray): Int {
+        var ans = 0
+        for (i in 0 until nums.size - 1) {
+            for (j in i + 1 until nums.size) {
+                if (nums[i] == nums[j] ||
+                    ((nums[j] - nums[i]) % 9 == 0 && check(nums[i], nums[j]))
+                ) {
+                    ans++
+                }
+            }
+        }
+        return ans
+    }
+
+    private fun check(a: Int, b: Int): Boolean {
+        var a = a
+        var b = b
+        val ca = IntArray(10)
+        val cb = IntArray(10)
+        var d = 0
+        while (a > 0 || b > 0) {
+            if (a % 10 != b % 10) {
+                d++
+                if (d > 2) {
+                    return false
+                }
+            }
+            ca[a % 10]++
+            cb[b % 10]++
+            a /= 10
+            b /= 10
+        }
+        return d == 2 && areEqual(ca, cb)
+    }
+
+    private fun areEqual(a: IntArray, b: IntArray): Boolean {
+        for (i in 0..9) {
+            if (a[i] != b[i]) {
+                return false
+            }
+        }
+        return true
+    }
+}
diff --git a/src/main/kotlin/g3201_3300/s3265_count_almost_equal_pairs_i/readme.md b/src/main/kotlin/g3201_3300/s3265_count_almost_equal_pairs_i/readme.md
new file mode 100644
index 00000000..90aa7942
--- /dev/null
+++ b/src/main/kotlin/g3201_3300/s3265_count_almost_equal_pairs_i/readme.md
@@ -0,0 +1,51 @@
+3265\. Count Almost Equal Pairs I
+
+Medium
+
+You are given an array `nums` consisting of positive integers.
+
+We call two integers `x` and `y` in this problem **almost equal** if both integers can become equal after performing the following operation **at most once**:
+
+*   Choose **either** `x` or `y` and swap any two digits within the chosen number.
+
+Return the number of indices `i` and `j` in `nums` where `i < j` such that `nums[i]` and `nums[j]` are **almost equal**.
+
+**Note** that it is allowed for an integer to have leading zeros after performing an operation.
+
+**Example 1:**
+
+**Input:** nums = [3,12,30,17,21]
+
+**Output:** 2
+
+**Explanation:**
+
+The almost equal pairs of elements are:
+
+*   3 and 30. By swapping 3 and 0 in 30, you get 3.
+*   12 and 21. By swapping 1 and 2 in 12, you get 21.
+
+**Example 2:**
+
+**Input:** nums = [1,1,1,1,1]
+
+**Output:** 10
+
+**Explanation:**
+
+Every two elements in the array are almost equal.
+
+**Example 3:**
+
+**Input:** nums = [123,231]
+
+**Output:** 0
+
+**Explanation:**
+
+We cannot swap any two digits of 123 or 231 to reach the other.
+
+**Constraints:**
+
+*   `2 <= nums.length <= 100`
+*   <code>1 <= nums[i] <= 10<sup>6</sup></code>
\ No newline at end of file
diff --git a/src/main/kotlin/g3201_3300/s3266_final_array_state_after_k_multiplication_operations_ii/Solution.kt b/src/main/kotlin/g3201_3300/s3266_final_array_state_after_k_multiplication_operations_ii/Solution.kt
new file mode 100644
index 00000000..0b200ceb
--- /dev/null
+++ b/src/main/kotlin/g3201_3300/s3266_final_array_state_after_k_multiplication_operations_ii/Solution.kt
@@ -0,0 +1,89 @@
+package g3201_3300.s3266_final_array_state_after_k_multiplication_operations_ii
+
+// #Hard #2024_08_28_Time_546_ms_(100.00%)_Space_60.8_MB_(66.67%)
+
+import java.util.PriorityQueue
+import kotlin.math.max
+
+@Suppress("NAME_SHADOWING")
+class Solution {
+    fun getFinalState(nums: IntArray, k: Int, multiplier: Int): IntArray {
+        var k = k
+        if (multiplier == 1) {
+            return nums
+        }
+        val n = nums.size
+        var mx = 0
+        for (x in nums) {
+            mx = max(mx, x)
+        }
+        val a = LongArray(n)
+        var left = k
+        var shouldExit = false
+        run {
+            var i = 0
+            while (i < n && !shouldExit) {
+                var x = nums[i].toLong()
+                while (x < mx) {
+                    x *= multiplier.toLong()
+                    if (--left < 0) {
+                        shouldExit = true
+                        break
+                    }
+                }
+                a[i] = x
+                i++
+            }
+        }
+        if (left < 0) {
+            val pq =
+                PriorityQueue { p: LongArray, q: LongArray ->
+                    if (p[0] != q[0]
+                    ) java.lang.Long.compare(p[0], q[0])
+                    else java.lang.Long.compare(p[1], q[1])
+                }
+            for (i in 0 until n) {
+                pq.offer(longArrayOf(nums[i].toLong(), i.toLong()))
+            }
+            while (k-- > 0) {
+                val p = pq.poll()
+                p[0] *= multiplier.toLong()
+                pq.offer(p)
+            }
+            while (pq.isNotEmpty()) {
+                val p = pq.poll()
+                nums[p[1].toInt()] = (p[0] % MOD).toInt()
+            }
+            return nums
+        }
+
+        val ids: Array<Int> = Array(n) { i: Int -> i }
+        ids.sortWith { i: Int?, j: Int? -> java.lang.Long.compare(a[i!!], a[j!!]) }
+        k = left
+        val pow1 = pow(multiplier.toLong(), k / n)
+        val pow2 = pow1 * multiplier % MOD
+        for (i in 0 until n) {
+            val j = ids[i]
+            nums[j] = (a[j] % MOD * (if (i < k % n) pow2 else pow1) % MOD).toInt()
+        }
+        return nums
+    }
+
+    private fun pow(x: Long, n: Int): Long {
+        var x = x
+        var n = n
+        var res: Long = 1
+        while (n > 0) {
+            if (n % 2 > 0) {
+                res = res * x % MOD
+            }
+            x = x * x % MOD
+            n /= 2
+        }
+        return res
+    }
+
+    companion object {
+        private const val MOD = 1000000007
+    }
+}
diff --git a/src/main/kotlin/g3201_3300/s3266_final_array_state_after_k_multiplication_operations_ii/readme.md b/src/main/kotlin/g3201_3300/s3266_final_array_state_after_k_multiplication_operations_ii/readme.md
new file mode 100644
index 00000000..be086870
--- /dev/null
+++ b/src/main/kotlin/g3201_3300/s3266_final_array_state_after_k_multiplication_operations_ii/readme.md
@@ -0,0 +1,52 @@
+3266\. Final Array State After K Multiplication Operations II
+
+Hard
+
+You are given an integer array `nums`, an integer `k`, and an integer `multiplier`.
+
+You need to perform `k` operations on `nums`. In each operation:
+
+*   Find the **minimum** value `x` in `nums`. If there are multiple occurrences of the minimum value, select the one that appears **first**.
+*   Replace the selected minimum value `x` with `x * multiplier`.
+
+After the `k` operations, apply **modulo** <code>10<sup>9</sup> + 7</code> to every value in `nums`.
+
+Return an integer array denoting the _final state_ of `nums` after performing all `k` operations and then applying the modulo.
+
+**Example 1:**
+
+**Input:** nums = [2,1,3,5,6], k = 5, multiplier = 2
+
+**Output:** [8,4,6,5,6]
+
+**Explanation:**
+
+| Operation               | Result           |
+|-------------------------|------------------|
+| After operation 1       | [2, 2, 3, 5, 6]  |
+| After operation 2       | [4, 2, 3, 5, 6]  |
+| After operation 3       | [4, 4, 3, 5, 6]  |
+| After operation 4       | [4, 4, 6, 5, 6]  |
+| After operation 5       | [8, 4, 6, 5, 6]  |
+| After applying modulo   | [8, 4, 6, 5, 6]  |
+
+**Example 2:**
+
+**Input:** nums = [100000,2000], k = 2, multiplier = 1000000
+
+**Output:** [999999307,999999993]
+
+**Explanation:**
+
+| Operation               | Result               |
+|-------------------------|----------------------|
+| After operation 1       | [100000, 2000000000] |
+| After operation 2       | [100000000000, 2000000000] |
+| After applying modulo   | [999999307, 999999993] |
+
+**Constraints:**
+
+*   <code>1 <= nums.length <= 10<sup>4</sup></code>
+*   <code>1 <= nums[i] <= 10<sup>9</sup></code>
+*   <code>1 <= k <= 10<sup>9</sup></code>
+*   <code>1 <= multiplier <= 10<sup>6</sup></code>
\ No newline at end of file
diff --git a/src/main/kotlin/g3201_3300/s3267_count_almost_equal_pairs_ii/Solution.kt b/src/main/kotlin/g3201_3300/s3267_count_almost_equal_pairs_ii/Solution.kt
new file mode 100644
index 00000000..9aa72bfe
--- /dev/null
+++ b/src/main/kotlin/g3201_3300/s3267_count_almost_equal_pairs_ii/Solution.kt
@@ -0,0 +1,57 @@
+package g3201_3300.s3267_count_almost_equal_pairs_ii
+
+// #Hard #2024_08_28_Time_791_ms_(100.00%)_Space_50.7_MB_(57.14%)
+
+class Solution {
+    fun countPairs(nums: IntArray): Int {
+        var pairs = 0
+        val counts: MutableMap<Int, Int> = HashMap()
+        nums.sort()
+        for (num in nums) {
+            val newNums: MutableSet<Int> = HashSet()
+            newNums.add(num)
+            var unit1 = 1
+            var remain1 = num
+            while (remain1 > 0) {
+                val digit1 = num / unit1 % 10
+                var unit2 = unit1 * 10
+                var remain2 = remain1 / 10
+                while (remain2 > 0
+                ) {
+                    val digit2 = num / unit2 % 10
+                    val newNum1 =
+                        num - digit1 * unit1 - digit2 * unit2 + digit2 * unit1 + digit1 * unit2
+                    newNums.add(newNum1)
+                    var unit3 = unit1 * 10
+                    var remain3 = remain1 / 10
+                    while (remain3 > 0
+                    ) {
+                        val digit3 = newNum1 / unit3 % 10
+                        var unit4 = unit3 * 10
+                        var remain4 = remain3 / 10
+                        while (remain4 > 0
+                        ) {
+                            val digit4 = newNum1 / unit4 % 10
+                            val newNum2 =
+                                newNum1 - digit3 * unit3 - digit4 * unit4 + digit4 * unit3 + digit3 * unit4
+                            newNums.add(newNum2)
+                            unit4 *= 10
+                            remain4 /= 10
+                        }
+                        unit3 *= 10
+                        remain3 /= 10
+                    }
+                    unit2 *= 10
+                    remain2 /= 10
+                }
+                unit1 *= 10
+                remain1 /= 10
+            }
+            for (newNum in newNums) {
+                pairs += counts.getOrDefault(newNum, 0)
+            }
+            counts[num] = counts.getOrDefault(num, 0) + 1
+        }
+        return pairs
+    }
+}
diff --git a/src/main/kotlin/g3201_3300/s3267_count_almost_equal_pairs_ii/readme.md b/src/main/kotlin/g3201_3300/s3267_count_almost_equal_pairs_ii/readme.md
new file mode 100644
index 00000000..b1941676
--- /dev/null
+++ b/src/main/kotlin/g3201_3300/s3267_count_almost_equal_pairs_ii/readme.md
@@ -0,0 +1,49 @@
+3267\. Count Almost Equal Pairs II
+
+Hard
+
+**Attention**: In this version, the number of operations that can be performed, has been increased to **twice**.
+
+You are given an array `nums` consisting of positive integers.
+
+We call two integers `x` and `y` **almost equal** if both integers can become equal after performing the following operation **at most <ins>twice</ins>**:
+
+*   Choose **either** `x` or `y` and swap any two digits within the chosen number.
+
+Return the number of indices `i` and `j` in `nums` where `i < j` such that `nums[i]` and `nums[j]` are **almost equal**.
+
+**Note** that it is allowed for an integer to have leading zeros after performing an operation.
+
+**Example 1:**
+
+**Input:** nums = [1023,2310,2130,213]
+
+**Output:** 4
+
+**Explanation:**
+
+The almost equal pairs of elements are:
+
+*   1023 and 2310. By swapping the digits 1 and 2, and then the digits 0 and 3 in 1023, you get 2310.
+*   1023 and 213. By swapping the digits 1 and 0, and then the digits 1 and 2 in 1023, you get 0213, which is 213.
+*   2310 and 213. By swapping the digits 2 and 0, and then the digits 3 and 2 in 2310, you get 0213, which is 213.
+*   2310 and 2130. By swapping the digits 3 and 1 in 2310, you get 2130.
+
+**Example 2:**
+
+**Input:** nums = [1,10,100]
+
+**Output:** 3
+
+**Explanation:**
+
+The almost equal pairs of elements are:
+
+*   1 and 10. By swapping the digits 1 and 0 in 10, you get 01 which is 1.
+*   1 and 100. By swapping the second 0 with the digit 1 in 100, you get 001, which is 1.
+*   10 and 100. By swapping the first 0 with the digit 1 in 100, you get 010, which is 10.
+
+**Constraints:**
+
+*   `2 <= nums.length <= 5000`
+*   <code>1 <= nums[i] < 10<sup>7</sup></code>
\ No newline at end of file
diff --git a/src/test/kotlin/g3201_3300/s3264_final_array_state_after_k_multiplication_operations_i/SolutionTest.kt b/src/test/kotlin/g3201_3300/s3264_final_array_state_after_k_multiplication_operations_i/SolutionTest.kt
new file mode 100644
index 00000000..77d0a10b
--- /dev/null
+++ b/src/test/kotlin/g3201_3300/s3264_final_array_state_after_k_multiplication_operations_i/SolutionTest.kt
@@ -0,0 +1,22 @@
+package g3201_3300.s3264_final_array_state_after_k_multiplication_operations_i
+
+import org.hamcrest.CoreMatchers.equalTo
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.jupiter.api.Test
+
+internal class SolutionTest {
+    @Test
+    fun finalState() {
+        assertThat(
+            Solution().getFinalState(intArrayOf(2, 1, 3, 5, 6), 5, 2),
+            equalTo(intArrayOf(8, 4, 6, 5, 6))
+        )
+    }
+
+    @Test
+    fun finalState2() {
+        assertThat(
+            Solution().getFinalState(intArrayOf(1, 2), 3, 4), equalTo(intArrayOf(16, 8))
+        )
+    }
+}
diff --git a/src/test/kotlin/g3201_3300/s3265_count_almost_equal_pairs_i/SolutionTest.kt b/src/test/kotlin/g3201_3300/s3265_count_almost_equal_pairs_i/SolutionTest.kt
new file mode 100644
index 00000000..d65ce420
--- /dev/null
+++ b/src/test/kotlin/g3201_3300/s3265_count_almost_equal_pairs_i/SolutionTest.kt
@@ -0,0 +1,22 @@
+package g3201_3300.s3265_count_almost_equal_pairs_i
+
+import org.hamcrest.CoreMatchers.equalTo
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.jupiter.api.Test
+
+internal class SolutionTest {
+    @Test
+    fun countPairs() {
+        assertThat(Solution().countPairs(intArrayOf(3, 12, 30, 17, 21)), equalTo(2))
+    }
+
+    @Test
+    fun countPairs2() {
+        assertThat(Solution().countPairs(intArrayOf(1, 1, 1, 1, 1)), equalTo(10))
+    }
+
+    @Test
+    fun countPairs3() {
+        assertThat(Solution().countPairs(intArrayOf(123, 231)), equalTo(0))
+    }
+}
diff --git a/src/test/kotlin/g3201_3300/s3266_final_array_state_after_k_multiplication_operations_ii/SolutionTest.kt b/src/test/kotlin/g3201_3300/s3266_final_array_state_after_k_multiplication_operations_ii/SolutionTest.kt
new file mode 100644
index 00000000..201101a6
--- /dev/null
+++ b/src/test/kotlin/g3201_3300/s3266_final_array_state_after_k_multiplication_operations_ii/SolutionTest.kt
@@ -0,0 +1,23 @@
+package g3201_3300.s3266_final_array_state_after_k_multiplication_operations_ii
+
+import org.hamcrest.CoreMatchers.equalTo
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.jupiter.api.Test
+
+internal class SolutionTest {
+    @Test
+    fun finalState() {
+        assertThat(
+            Solution().getFinalState(intArrayOf(2, 1, 3, 5, 6), 5, 2),
+            equalTo(intArrayOf(8, 4, 6, 5, 6))
+        )
+    }
+
+    @Test
+    fun finalState2() {
+        assertThat(
+            Solution().getFinalState(intArrayOf(100000, 2000), 2, 1000000),
+            equalTo(intArrayOf(999999307, 999999993))
+        )
+    }
+}
diff --git a/src/test/kotlin/g3201_3300/s3267_count_almost_equal_pairs_ii/SolutionTest.kt b/src/test/kotlin/g3201_3300/s3267_count_almost_equal_pairs_ii/SolutionTest.kt
new file mode 100644
index 00000000..272fa8e5
--- /dev/null
+++ b/src/test/kotlin/g3201_3300/s3267_count_almost_equal_pairs_ii/SolutionTest.kt
@@ -0,0 +1,17 @@
+package g3201_3300.s3267_count_almost_equal_pairs_ii
+
+import org.hamcrest.CoreMatchers.equalTo
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.jupiter.api.Test
+
+internal class SolutionTest {
+    @Test
+    fun countPairs() {
+        assertThat(Solution().countPairs(intArrayOf(1023, 2310, 2130, 213)), equalTo(4))
+    }
+
+    @Test
+    fun countPairs2() {
+        assertThat(Solution().countPairs(intArrayOf(1, 10, 100)), equalTo(3))
+    }
+}