diff --git a/problems/boats-to-save-people.cpp b/problems/cpp/boats-to-save-people.cpp
similarity index 100%
rename from problems/boats-to-save-people.cpp
rename to problems/cpp/boats-to-save-people.cpp
diff --git a/problems/can-place-flowers.cpp b/problems/cpp/can-place-flowers.cpp
similarity index 100%
rename from problems/can-place-flowers.cpp
rename to problems/cpp/can-place-flowers.cpp
diff --git a/problems/count-good-nodes-in-binary-tree.cpp b/problems/cpp/count-good-nodes-in-binary-tree.cpp
similarity index 100%
rename from problems/count-good-nodes-in-binary-tree.cpp
rename to problems/cpp/count-good-nodes-in-binary-tree.cpp
diff --git a/problems/count-ways-to-build-good-strings.cpp b/problems/cpp/count-ways-to-build-good-strings.cpp
similarity index 100%
rename from problems/count-ways-to-build-good-strings.cpp
rename to problems/cpp/count-ways-to-build-good-strings.cpp
diff --git a/problems/design-parking-system.cpp b/problems/cpp/design-parking-system.cpp
similarity index 100%
rename from problems/design-parking-system.cpp
rename to problems/cpp/design-parking-system.cpp
diff --git a/problems/determine-if-two-strings-are-close.cpp b/problems/cpp/determine-if-two-strings-are-close.cpp
similarity index 100%
rename from problems/determine-if-two-strings-are-close.cpp
rename to problems/cpp/determine-if-two-strings-are-close.cpp
diff --git a/problems/divide-a-string-into-groups-of-size-k.cpp b/problems/cpp/divide-a-string-into-groups-of-size-k.cpp
similarity index 100%
rename from problems/divide-a-string-into-groups-of-size-k.cpp
rename to problems/cpp/divide-a-string-into-groups-of-size-k.cpp
diff --git a/problems/kth-smallest-element-in-a-sorted-matrix.cpp b/problems/cpp/kth-smallest-element-in-a-sorted-matrix.cpp
similarity index 100%
rename from problems/kth-smallest-element-in-a-sorted-matrix.cpp
rename to problems/cpp/kth-smallest-element-in-a-sorted-matrix.cpp
diff --git a/problems/matrix-diagonal-sum.cpp b/problems/cpp/matrix-diagonal-sum.cpp
similarity index 100%
rename from problems/matrix-diagonal-sum.cpp
rename to problems/cpp/matrix-diagonal-sum.cpp
diff --git a/problems/max-sum-of-rectangle-no-larger-than-k.cpp b/problems/cpp/max-sum-of-rectangle-no-larger-than-k.cpp
similarity index 100%
rename from problems/max-sum-of-rectangle-no-larger-than-k.cpp
rename to problems/cpp/max-sum-of-rectangle-no-larger-than-k.cpp
diff --git a/problems/maximum-running-time-of-n-computers.cpp b/problems/cpp/maximum-running-time-of-n-computers.cpp
similarity index 100%
rename from problems/maximum-running-time-of-n-computers.cpp
rename to problems/cpp/maximum-running-time-of-n-computers.cpp
diff --git a/problems/merge-strings-alternately.cpp b/problems/cpp/merge-strings-alternately.cpp
similarity index 100%
rename from problems/merge-strings-alternately.cpp
rename to problems/cpp/merge-strings-alternately.cpp
diff --git a/problems/middle-of-the-linked-list.cpp b/problems/cpp/middle-of-the-linked-list.cpp
similarity index 100%
rename from problems/middle-of-the-linked-list.cpp
rename to problems/cpp/middle-of-the-linked-list.cpp
diff --git a/problems/minimum-moves-to-reach-target-score.cpp b/problems/cpp/minimum-moves-to-reach-target-score.cpp
similarity index 100%
rename from problems/minimum-moves-to-reach-target-score.cpp
rename to problems/cpp/minimum-moves-to-reach-target-score.cpp
diff --git a/problems/mirror-reflection.cpp b/problems/cpp/mirror-reflection.cpp
similarity index 100%
rename from problems/mirror-reflection.cpp
rename to problems/cpp/mirror-reflection.cpp
diff --git a/problems/my-calendar-i.cpp b/problems/cpp/my-calendar-i.cpp
similarity index 100%
rename from problems/my-calendar-i.cpp
rename to problems/cpp/my-calendar-i.cpp
diff --git a/problems/n-ary-tree-level-order-traversal.cpp b/problems/cpp/n-ary-tree-level-order-traversal.cpp
similarity index 100%
rename from problems/n-ary-tree-level-order-traversal.cpp
rename to problems/cpp/n-ary-tree-level-order-traversal.cpp
diff --git a/problems/n-ary-tree-preorder-traversal.cpp b/problems/cpp/n-ary-tree-preorder-traversal.cpp
similarity index 100%
rename from problems/n-ary-tree-preorder-traversal.cpp
rename to problems/cpp/n-ary-tree-preorder-traversal.cpp
diff --git a/problems/number-of-matching-subsequences.cpp b/problems/cpp/number-of-matching-subsequences.cpp
similarity index 100%
rename from problems/number-of-matching-subsequences.cpp
rename to problems/cpp/number-of-matching-subsequences.cpp
diff --git a/problems/numbers-with-same-consecutive-differences.cpp b/problems/cpp/numbers-with-same-consecutive-differences.cpp
similarity index 100%
rename from problems/numbers-with-same-consecutive-differences.cpp
rename to problems/cpp/numbers-with-same-consecutive-differences.cpp
diff --git a/problems/out-of-boundary-paths.cpp b/problems/cpp/out-of-boundary-paths.cpp
similarity index 100%
rename from problems/out-of-boundary-paths.cpp
rename to problems/cpp/out-of-boundary-paths.cpp
diff --git a/problems/palindrome-linked-list.cpp b/problems/cpp/palindrome-linked-list.cpp
similarity index 99%
rename from problems/palindrome-linked-list.cpp
rename to problems/cpp/palindrome-linked-list.cpp
index 04f2314..c6ba84a 100644
--- a/problems/palindrome-linked-list.cpp
+++ b/problems/cpp/palindrome-linked-list.cpp
@@ -169,4 +169,4 @@ int main()
     assert(test_isPalindrome(std::vector { 1 }));
 
     return 0;
-}
\ No newline at end of file
+}
diff --git a/problems/partition-list.cpp b/problems/cpp/partition-list.cpp
similarity index 100%
rename from problems/partition-list.cpp
rename to problems/cpp/partition-list.cpp
diff --git a/problems/pascals-triangle-ii.cpp b/problems/cpp/pascals-triangle-ii.cpp
similarity index 100%
rename from problems/pascals-triangle-ii.cpp
rename to problems/cpp/pascals-triangle-ii.cpp
diff --git a/problems/pascals-triangle.cpp b/problems/cpp/pascals-triangle.cpp
similarity index 100%
rename from problems/pascals-triangle.cpp
rename to problems/cpp/pascals-triangle.cpp
diff --git a/problems/ransom-note.cpp b/problems/cpp/ransom-note.cpp
similarity index 100%
rename from problems/ransom-note.cpp
rename to problems/cpp/ransom-note.cpp
diff --git a/problems/removing-stars-from-a-string.cpp b/problems/cpp/removing-stars-from-a-string.cpp
similarity index 100%
rename from problems/removing-stars-from-a-string.cpp
rename to problems/cpp/removing-stars-from-a-string.cpp
diff --git a/problems/reordered-power-of-2.cpp b/problems/cpp/reordered-power-of-2.cpp
similarity index 100%
rename from problems/reordered-power-of-2.cpp
rename to problems/cpp/reordered-power-of-2.cpp
diff --git a/problems/rotate-image.cpp b/problems/cpp/rotate-image.cpp
similarity index 100%
rename from problems/rotate-image.cpp
rename to problems/cpp/rotate-image.cpp
diff --git a/problems/same-tree.cpp b/problems/cpp/same-tree.cpp
similarity index 100%
rename from problems/same-tree.cpp
rename to problems/cpp/same-tree.cpp
diff --git a/problems/solving-questions-with-brainpower.cpp b/problems/cpp/solving-questions-with-brainpower.cpp
similarity index 100%
rename from problems/solving-questions-with-brainpower.cpp
rename to problems/cpp/solving-questions-with-brainpower.cpp
diff --git a/problems/sort-the-matrix-diagonally.cpp b/problems/cpp/sort-the-matrix-diagonally.cpp
similarity index 100%
rename from problems/sort-the-matrix-diagonally.cpp
rename to problems/cpp/sort-the-matrix-diagonally.cpp
diff --git a/problems/spiral-matrix-ii.cpp b/problems/cpp/spiral-matrix-ii.cpp
similarity index 100%
rename from problems/spiral-matrix-ii.cpp
rename to problems/cpp/spiral-matrix-ii.cpp
diff --git a/problems/spiral-matrix.cpp b/problems/cpp/spiral-matrix.cpp
similarity index 100%
rename from problems/spiral-matrix.cpp
rename to problems/cpp/spiral-matrix.cpp
diff --git a/problems/unique-paths.cpp b/problems/cpp/unique-paths.cpp
similarity index 100%
rename from problems/unique-paths.cpp
rename to problems/cpp/unique-paths.cpp
diff --git a/problems/utf-8-validation.cpp b/problems/cpp/utf-8-validation.cpp
similarity index 100%
rename from problems/utf-8-validation.cpp
rename to problems/cpp/utf-8-validation.cpp
diff --git a/problems/valid-parentheses.cpp b/problems/cpp/valid-parentheses.cpp
similarity index 100%
rename from problems/valid-parentheses.cpp
rename to problems/cpp/valid-parentheses.cpp
diff --git a/problems/vertical-order-traversal-of-a-binary-tree.cpp b/problems/cpp/vertical-order-traversal-of-a-binary-tree.cpp
similarity index 100%
rename from problems/vertical-order-traversal-of-a-binary-tree.cpp
rename to problems/cpp/vertical-order-traversal-of-a-binary-tree.cpp
diff --git a/problems/average-of-levels-in-binary-tree.cs b/problems/cs/average-of-levels-in-binary-tree.cs
similarity index 100%
rename from problems/average-of-levels-in-binary-tree.cs
rename to problems/cs/average-of-levels-in-binary-tree.cs
diff --git a/problems/binary-tree-pruning.cs b/problems/cs/binary-tree-pruning.cs
similarity index 100%
rename from problems/binary-tree-pruning.cs
rename to problems/cs/binary-tree-pruning.cs
diff --git a/problems/poor-pigs.cs b/problems/cs/poor-pigs.cs
similarity index 100%
rename from problems/poor-pigs.cs
rename to problems/cs/poor-pigs.cs
diff --git a/problems/binary-search-tree-iterator.java b/problems/java/binary-search-tree-iterator.java
similarity index 100%
rename from problems/binary-search-tree-iterator.java
rename to problems/java/binary-search-tree-iterator.java
diff --git a/problems/combination-sum-iv.java b/problems/java/combination-sum-iv.java
similarity index 100%
rename from problems/combination-sum-iv.java
rename to problems/java/combination-sum-iv.java
diff --git a/problems/convert-sorted-array-to-binary-search-tree.java b/problems/java/convert-sorted-array-to-binary-search-tree.java
similarity index 100%
rename from problems/convert-sorted-array-to-binary-search-tree.java
rename to problems/java/convert-sorted-array-to-binary-search-tree.java
diff --git a/problems/flatten-nested-list-iterator.java b/problems/java/flatten-nested-list-iterator.java
similarity index 100%
rename from problems/flatten-nested-list-iterator.java
rename to problems/java/flatten-nested-list-iterator.java
diff --git a/problems/n-ary-tree-level-order-traversal.java b/problems/java/n-ary-tree-level-order-traversal.java
similarity index 100%
rename from problems/n-ary-tree-level-order-traversal.java
rename to problems/java/n-ary-tree-level-order-traversal.java
diff --git a/problems/peeking-iterator.java b/problems/java/peeking-iterator.java
similarity index 100%
rename from problems/peeking-iterator.java
rename to problems/java/peeking-iterator.java
diff --git a/problems/rle-iterator.java b/problems/java/rle-iterator.java
similarity index 100%
rename from problems/rle-iterator.java
rename to problems/java/rle-iterator.java
diff --git a/problems/allow-one-function-call.js b/problems/js/allow-one-function-call.js
similarity index 100%
rename from problems/allow-one-function-call.js
rename to problems/js/allow-one-function-call.js
diff --git a/problems/apply-transform-over-each-element-in-array.js b/problems/js/apply-transform-over-each-element-in-array.js
similarity index 100%
rename from problems/apply-transform-over-each-element-in-array.js
rename to problems/js/apply-transform-over-each-element-in-array.js
diff --git a/problems/array-reduce-transformation.js b/problems/js/array-reduce-transformation.js
similarity index 100%
rename from problems/array-reduce-transformation.js
rename to problems/js/array-reduce-transformation.js
diff --git a/problems/cache-with-time-limit.js b/problems/js/cache-with-time-limit.js
similarity index 100%
rename from problems/cache-with-time-limit.js
rename to problems/js/cache-with-time-limit.js
diff --git a/problems/counter-ii.js b/problems/js/counter-ii.js
similarity index 100%
rename from problems/counter-ii.js
rename to problems/js/counter-ii.js
diff --git a/problems/counter.js b/problems/js/counter.js
similarity index 100%
rename from problems/counter.js
rename to problems/js/counter.js
diff --git a/problems/create-hello-world-function.js b/problems/js/create-hello-world-function.js
similarity index 100%
rename from problems/create-hello-world-function.js
rename to problems/js/create-hello-world-function.js
diff --git a/problems/curry.js b/problems/js/curry.js
similarity index 100%
rename from problems/curry.js
rename to problems/js/curry.js
diff --git a/problems/debounce.js b/problems/js/debounce.js
similarity index 100%
rename from problems/debounce.js
rename to problems/js/debounce.js
diff --git a/problems/filter-elements-from-array.js b/problems/js/filter-elements-from-array.js
similarity index 100%
rename from problems/filter-elements-from-array.js
rename to problems/js/filter-elements-from-array.js
diff --git a/problems/function-composition.js b/problems/js/function-composition.js
similarity index 100%
rename from problems/function-composition.js
rename to problems/js/function-composition.js
diff --git a/problems/memoize.js b/problems/js/memoize.js
similarity index 100%
rename from problems/memoize.js
rename to problems/js/memoize.js
diff --git a/problems/promise-pool.js b/problems/js/promise-pool.js
similarity index 100%
rename from problems/promise-pool.js
rename to problems/js/promise-pool.js
diff --git a/problems/promise-time-limit.js b/problems/js/promise-time-limit.js
similarity index 100%
rename from problems/promise-time-limit.js
rename to problems/js/promise-time-limit.js
diff --git a/problems/sleep.js b/problems/js/sleep.js
similarity index 100%
rename from problems/sleep.js
rename to problems/js/sleep.js
diff --git a/problems/throttle.js b/problems/js/throttle.js
similarity index 100%
rename from problems/throttle.js
rename to problems/js/throttle.js
diff --git a/problems/binary-tree-inorder-traversal.kt b/problems/kt/binary-tree-inorder-traversal.kt
similarity index 100%
rename from problems/binary-tree-inorder-traversal.kt
rename to problems/kt/binary-tree-inorder-traversal.kt
diff --git a/problems/binary-tree-level-order-traversal.kt b/problems/kt/binary-tree-level-order-traversal.kt
similarity index 97%
rename from problems/binary-tree-level-order-traversal.kt
rename to problems/kt/binary-tree-level-order-traversal.kt
index 21ca888..f8e4680 100644
--- a/problems/binary-tree-level-order-traversal.kt
+++ b/problems/kt/binary-tree-level-order-traversal.kt
@@ -13,15 +13,15 @@ class Solution {
         if (root == null) {
             return levels
         }
-        
+
         if (level + 1 > levels.size) {
             levels.add(mutableListOf<Int>())
         }
-        
+
         levels[level].add(root.`val`)
         levelOrder(root.left, levels, level + 1)
         return levelOrder(root.right, levels, level + 1)
     }
-    
+
     fun levelOrder(root: TreeNode?): List<List<Int>> = levelOrder(root, mutableListOf<MutableList<Int>>(), 0)
 }
diff --git a/problems/check-if-every-row-and-column-contains-all-numbers.kt b/problems/kt/check-if-every-row-and-column-contains-all-numbers.kt
similarity index 100%
rename from problems/check-if-every-row-and-column-contains-all-numbers.kt
rename to problems/kt/check-if-every-row-and-column-contains-all-numbers.kt
diff --git a/problems/construct-string-from-binary-tree.kt b/problems/kt/construct-string-from-binary-tree.kt
similarity index 100%
rename from problems/construct-string-from-binary-tree.kt
rename to problems/kt/construct-string-from-binary-tree.kt
diff --git a/problems/first-unique-character-in-a-string.kt b/problems/kt/first-unique-character-in-a-string.kt
similarity index 100%
rename from problems/first-unique-character-in-a-string.kt
rename to problems/kt/first-unique-character-in-a-string.kt
diff --git a/problems/iterator-for-combination.kt b/problems/kt/iterator-for-combination.kt
similarity index 100%
rename from problems/iterator-for-combination.kt
rename to problems/kt/iterator-for-combination.kt
diff --git a/problems/lowest-common-ancestor-of-a-binary-search-tree.kt b/problems/kt/lowest-common-ancestor-of-a-binary-search-tree.kt
similarity index 100%
rename from problems/lowest-common-ancestor-of-a-binary-search-tree.kt
rename to problems/kt/lowest-common-ancestor-of-a-binary-search-tree.kt
diff --git a/problems/max-area-of-island.kt b/problems/kt/max-area-of-island.kt
similarity index 100%
rename from problems/max-area-of-island.kt
rename to problems/kt/max-area-of-island.kt
diff --git a/problems/maximize-distance-to-closest-person.kt b/problems/kt/maximize-distance-to-closest-person.kt
similarity index 100%
rename from problems/maximize-distance-to-closest-person.kt
rename to problems/kt/maximize-distance-to-closest-person.kt
diff --git a/problems/maximum-units-on-a-truck.kt b/problems/kt/maximum-units-on-a-truck.kt
similarity index 100%
rename from problems/maximum-units-on-a-truck.kt
rename to problems/kt/maximum-units-on-a-truck.kt
diff --git a/problems/minimum-number-of-refueling-stops.kt b/problems/kt/minimum-number-of-refueling-stops.kt
similarity index 100%
rename from problems/minimum-number-of-refueling-stops.kt
rename to problems/kt/minimum-number-of-refueling-stops.kt
diff --git a/problems/power-of-three.kt b/problems/kt/power-of-three.kt
similarity index 100%
rename from problems/power-of-three.kt
rename to problems/kt/power-of-three.kt
diff --git a/problems/roman-to-integer.kt b/problems/kt/roman-to-integer.kt
similarity index 100%
rename from problems/roman-to-integer.kt
rename to problems/kt/roman-to-integer.kt
diff --git a/problems/split-array-into-consecutive-subsequences.kt b/problems/kt/split-array-into-consecutive-subsequences.kt
similarity index 100%
rename from problems/split-array-into-consecutive-subsequences.kt
rename to problems/kt/split-array-into-consecutive-subsequences.kt
diff --git a/problems/substring-with-concatenation-of-all-words.kt b/problems/kt/substring-with-concatenation-of-all-words.kt
similarity index 100%
rename from problems/substring-with-concatenation-of-all-words.kt
rename to problems/kt/substring-with-concatenation-of-all-words.kt
diff --git a/problems/unique-morse-code-words.kt b/problems/kt/unique-morse-code-words.kt
similarity index 100%
rename from problems/unique-morse-code-words.kt
rename to problems/kt/unique-morse-code-words.kt
diff --git a/problems/validate-binary-search-tree.kt b/problems/kt/validate-binary-search-tree.kt
similarity index 100%
rename from problems/validate-binary-search-tree.kt
rename to problems/kt/validate-binary-search-tree.kt
diff --git a/problems/word-ladder-ii.kt b/problems/kt/word-ladder-ii.kt
similarity index 100%
rename from problems/word-ladder-ii.kt
rename to problems/kt/word-ladder-ii.kt
diff --git a/problems/binary-search.rb b/problems/rb/binary-search.rb
similarity index 100%
rename from problems/binary-search.rb
rename to problems/rb/binary-search.rb
diff --git a/problems/climbing-stairs.rb b/problems/rb/climbing-stairs.rb
similarity index 100%
rename from problems/climbing-stairs.rb
rename to problems/rb/climbing-stairs.rb
diff --git a/problems/contains-duplicate.rb b/problems/rb/contains-duplicate.rb
similarity index 100%
rename from problems/contains-duplicate.rb
rename to problems/rb/contains-duplicate.rb
diff --git a/problems/fibonacci-number.rb b/problems/rb/fibonacci-number.rb
similarity index 100%
rename from problems/fibonacci-number.rb
rename to problems/rb/fibonacci-number.rb
diff --git a/problems/first-bad-version.rb b/problems/rb/first-bad-version.rb
similarity index 100%
rename from problems/first-bad-version.rb
rename to problems/rb/first-bad-version.rb
diff --git a/problems/insert-into-a-binary-search-tree.rb b/problems/rb/insert-into-a-binary-search-tree.rb
similarity index 100%
rename from problems/insert-into-a-binary-search-tree.rb
rename to problems/rb/insert-into-a-binary-search-tree.rb
diff --git a/problems/linked-list-cycle-ii.rb b/problems/rb/linked-list-cycle-ii.rb
similarity index 100%
rename from problems/linked-list-cycle-ii.rb
rename to problems/rb/linked-list-cycle-ii.rb
diff --git a/problems/maximum-subarray.rb b/problems/rb/maximum-subarray.rb
similarity index 100%
rename from problems/maximum-subarray.rb
rename to problems/rb/maximum-subarray.rb
diff --git a/problems/merge-sorted-array.rb b/problems/rb/merge-sorted-array.rb
similarity index 100%
rename from problems/merge-sorted-array.rb
rename to problems/rb/merge-sorted-array.rb
diff --git a/problems/min-cost-climbing-stairs.rb b/problems/rb/min-cost-climbing-stairs.rb
similarity index 100%
rename from problems/min-cost-climbing-stairs.rb
rename to problems/rb/min-cost-climbing-stairs.rb
diff --git a/problems/rotate-array.rb b/problems/rb/rotate-array.rb
similarity index 100%
rename from problems/rotate-array.rb
rename to problems/rb/rotate-array.rb
diff --git a/problems/search-insert-position.rb b/problems/rb/search-insert-position.rb
similarity index 100%
rename from problems/search-insert-position.rb
rename to problems/rb/search-insert-position.rb
diff --git a/problems/squares-of-a-sorted-array.rb b/problems/rb/squares-of-a-sorted-array.rb
similarity index 100%
rename from problems/squares-of-a-sorted-array.rb
rename to problems/rb/squares-of-a-sorted-array.rb
diff --git a/problems/tribonacci.rb b/problems/rb/tribonacci.rb
similarity index 100%
rename from problems/tribonacci.rb
rename to problems/rb/tribonacci.rb
diff --git a/problems/two-sum.rb b/problems/rb/two-sum.rb
similarity index 100%
rename from problems/two-sum.rb
rename to problems/rb/two-sum.rb
diff --git a/problems/word-pattern.rb b/problems/rb/word-pattern.rb
similarity index 100%
rename from problems/word-pattern.rb
rename to problems/rb/word-pattern.rb
diff --git a/problems/add-digits.rs b/problems/rs/add-digits.rs
similarity index 100%
rename from problems/add-digits.rs
rename to problems/rs/add-digits.rs
diff --git a/problems/best-time-to-buy-and-sell-stock-iv.rs b/problems/rs/best-time-to-buy-and-sell-stock-iv.rs
similarity index 100%
rename from problems/best-time-to-buy-and-sell-stock-iv.rs
rename to problems/rs/best-time-to-buy-and-sell-stock-iv.rs
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