diff --git a/contest/src/main/java/com/github/contest/Execute.kt b/contest/src/main/java/com/github/contest/Execute.kt
index ca6cd770..3999f700 100644
--- a/contest/src/main/java/com/github/contest/Execute.kt
+++ b/contest/src/main/java/com/github/contest/Execute.kt
@@ -1,10 +1,10 @@
 package com.github.contest
 
 
-import com.github.contest.array.isZeroArray
 import com.github.contest.math.numberOfPowerfulInt
 import com.github.contest.slidingWindow.customStructure.rabinKarpMultiPattern
 import com.github.contest.slidingWindow.customStructure.slidingWindowClassic
+import com.github.contest.slidingWindow.maximumRobots
 import com.github.contest.strings.fullJustify
 import com.github.contest.strings.subStrHash
 import java.util.TreeMap
@@ -15,11 +15,7 @@ import java.util.TreeMap
  */
 
 fun main() {
-
-    val nums = intArrayOf(3, 3, 2, 1)
-    val queries = arrayOf(intArrayOf(1, 3), intArrayOf(0, 2), intArrayOf(0, 0), intArrayOf(0, 0))
-
-    isZeroArray(nums, queries).also { println(it) }
+    maximumRobots(intArrayOf(3, 6, 1, 3, 4), intArrayOf(2, 1, 3, 4, 5), 25).also { println(it) }
 }
 
 
diff --git a/contest/src/main/java/com/github/contest/array/ArrayLeetcode.kt b/contest/src/main/java/com/github/contest/array/ArrayLeetcode.kt
index 00becc8e..eb6513b1 100644
--- a/contest/src/main/java/com/github/contest/array/ArrayLeetcode.kt
+++ b/contest/src/main/java/com/github/contest/array/ArrayLeetcode.kt
@@ -1,6 +1,7 @@
 package com.github.contest.array
 
 import java.util.PriorityQueue
+import kotlin.math.abs
 
 
 /**
@@ -403,4 +404,23 @@ fun isZeroArray(nums: IntArray, queries: Array<IntArray>): Boolean {
     return true
 }
 
+/**
+ * 2932. Maximum Strong Pair XOR I
+ */
+
+fun maximumStrongPairXor(nums: IntArray): Int {
+    val pairs = mutableListOf<Pair<Int, Int>>()
+
+    for (i in nums.indices) {
+        pairs.add(Pair(nums[i], nums[i]))
+        for (j in i + 1 until nums.size) {
+            pairs.add(Pair(nums[i], nums[j]))
+        }
+    }
+
+    return pairs
+        .filter { abs(it.first - it.second) <= minOf(it.first, it.second) }
+        .maxOf { it.first xor it.second }
+}
+
 
diff --git a/contest/src/main/java/com/github/contest/slidingWindow/SlidingWindowAlternativeSolution.kt b/contest/src/main/java/com/github/contest/slidingWindow/SlidingWindowAlternativeSolution.kt
index fea6fb11..94607a0a 100644
--- a/contest/src/main/java/com/github/contest/slidingWindow/SlidingWindowAlternativeSolution.kt
+++ b/contest/src/main/java/com/github/contest/slidingWindow/SlidingWindowAlternativeSolution.kt
@@ -109,4 +109,33 @@ fun getSubArrayBeautyAlternativeSolution(nums: IntArray, k: Int, x: Int): IntArr
     return res.toIntArray()
 }
 
+/**
+ * 413. Arithmetic Slices
+ * Alternative Solution with O(n)
+ */
+
+fun numberOfArithmeticSlicesAlternativeSolution(nums: IntArray): Int {
+    if (nums.size < 3) return 0
+
+    var left = 0
+    var count = 0
+    val k = 3
+    var diff = nums[1] - nums[0]
+
+    for (right in 2 until nums.size) {
+
+        if (nums[right] - nums[right - 1] != diff) {
+            diff = nums[right] - nums[right - 1]
+            left = right - 1
+        }
+
+        if (right - left >= k - 1) {
+            count++
+            count += ((right - left) - (k - 1))
+        }
+    }
+
+    return count
+}
+
 
diff --git a/contest/src/main/java/com/github/contest/slidingWindow/SlidingWindowLeetcode.kt b/contest/src/main/java/com/github/contest/slidingWindow/SlidingWindowLeetcode.kt
index b19b1c64..f7b0cd23 100644
--- a/contest/src/main/java/com/github/contest/slidingWindow/SlidingWindowLeetcode.kt
+++ b/contest/src/main/java/com/github/contest/slidingWindow/SlidingWindowLeetcode.kt
@@ -546,6 +546,105 @@ fun maxSatisfied(customers: IntArray, grumpy: IntArray, minutes: Int): Int {
     return maxCustomers
 }
 
+/**
+ * 3090. Maximum Length Substring With Two Occurrences
+ */
+
+fun maximumLengthSubstring(s: String): Int {
+    if (s.length == 2) return 2
+
+    var maxLen = 0
+    var left = 0
+    val freq = mutableMapOf<Char, Int>()
+
+    for (right in s.indices) {
+
+        val char = s[right]
+        freq[char] = freq.getOrDefault(char, 0) + 1
+
+        if (!isValidSubString(freq)) {
+            freq[s[left]] = freq.getOrDefault(s[left], 0) - 1
+            if (freq[s[left]] == 0) freq.remove(s[left])
+            left++
+        }
+
+        maxLen = maxOf(maxLen, right - left + 1)
+    }
+
+    return maxLen
+}
+
+private fun isValidSubString(map: Map<Char, Int>): Boolean {
+
+    for ((_, value) in map) {
+        if (value > 2) return false
+    }
+
+    return true
+}
+
+/**
+ * 2398. Maximum Number of Robots Within Budget
+ */
+
+fun maximumRobots(chargeTimes: IntArray, runningCosts: IntArray, budget: Long): Int {
+    var maxRobots = 0
+    var left = 0
+    var sum = 0L
+    val window = mutableListOf<Long>()
+
+    for (right in chargeTimes.indices) {
+        window.add(chargeTimes[right].toLong())
+        sum += runningCosts[right].toLong()
+        var max = window.maxOrNull() ?: 0L
+        var k = (right - left + 1).toLong()
+        var cost = max + (k * sum)
+
+        while (cost > budget) {
+            sum -= runningCosts[left]
+            window.removeFirst()
+            left++
+            max = window.maxOrNull() ?: 0L
+            k = (right - left + 1).toLong()
+            cost = max + (k * sum)
+        }
+
+        maxRobots = maxOf(maxRobots, right - left + 1)
+    }
+
+    return maxRobots
+}
+
+/**
+ * 413. Arithmetic Slices
+ */
+
+fun numberOfArithmeticSlices(nums: IntArray): Int {
+    if (nums.size < 3) return 0
+
+    var count = 0
+
+    (3..nums.size).forEach { window ->
+        nums.toList().windowed(window) {
+            var isValid = true
+            val diff = it[1] - it[0]
+
+            for (i in 2 until it.size) {
+                if (it[i] - it[i - 1] != diff) {
+                    isValid = false
+                    break
+                }
+            }
+
+            if (isValid) count++
+        }
+    }
+
+    return count
+}
+
+
+