diff --git a/.gitignore b/.gitignore
index 6a97041..61d05e0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 # Edit at https://www.toptal.com/developers/gitignore?templates=node,java,python,c++
 .cursor*
 *src/notes*
+*backup/
 ./src/notes/
 *sync_leetcode.sh
 ### C++ ###
diff --git a/src/exercises/1048.longest-string-chain.js b/src/exercises/1048.longest-string-chain.js
new file mode 100644
index 0000000..c0d9970
--- /dev/null
+++ b/src/exercises/1048.longest-string-chain.js
@@ -0,0 +1,23 @@
+// @leet start
+/**
+ * @param {string[]} words
+ * @return {number}
+ */
+var longestStrChain = function (words) {
+  let cache = {};
+  words.sort((a, b) => a.length - b.length);
+
+  let max = 0;
+  for (let word of words) {
+    let longest = 0;
+    for (let i = 0; i < word.length; i++) {
+      let subWord = word.slice(0, i) + word.slice(i + 1);
+      longest = Math.max(longest, (cache[subWord] || 0) + 1);
+    }
+    cache[word] = longest;
+    max = Math.max(max, longest);
+  }
+  return max;
+};
+// @leet end
+
diff --git a/src/exercises/11.container-with-most-water.py b/src/exercises/11.container-with-most-water.py
index ab42d88..08162fd 100644
--- a/src/exercises/11.container-with-most-water.py
+++ b/src/exercises/11.container-with-most-water.py
@@ -50,4 +50,3 @@ class Solution:
 
 
 # @leet end
-
diff --git a/src/exercises/1302.deepest-leaves-sum.py b/src/exercises/1302.deepest-leaves-sum.py
new file mode 100644
index 0000000..33164be
--- /dev/null
+++ b/src/exercises/1302.deepest-leaves-sum.py
@@ -0,0 +1,72 @@
+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+
+# @leet imports end
+
+
+# @leet start
+# Definition for a binary tree node.
+# class TreeNode:
+#     def __init__(self, val=0, left=None, right=None):
+#         self.val = val
+#         self.left = left
+#         self.right = right
+class Solution:
+    def deepestLeavesSum(self, root: Optional[TreeNode]) -> int:
+        self.max_dep = 0
+        self.sum_max = 0
+
+        def dfs(node: TreeNode, depth: int):
+            if not node:
+                return
+
+            if not node.left and not node.right:
+                if depth > self.max_dep:
+                    self.max_dep = depth
+                    self.sum_max = node.val
+                elif depth == self.max_dep:
+                    self.sum_max += node.val
+
+            else:
+                dfs(node.left, depth + 1)
+                dfs(node.right, depth + 1)
+
+        dfs(root, 0)
+        return self.sum_max
+
+
+# @leet end
+
diff --git a/src/exercises/135.candy.py b/src/exercises/135.candy.py
index d7f9b75..c966786 100644
--- a/src/exercises/135.candy.py
+++ b/src/exercises/135.candy.py
@@ -44,10 +44,9 @@ class Solution:
 
         for i in range(len(ratings) - 2, -1, -1):
             if ratings[i] > ratings[i + 1]:
-                arr[i] = max(arr[i], arr[i + 1] + 1)
+                arr[i] = max(arr[i + 1] + 1, arr[i])
 
         return sum(arr)
 
 
 # @leet end
-
diff --git a/src/exercises/151.reverse-words-in-a-string.py b/src/exercises/151.reverse-words-in-a-string.py
new file mode 100644
index 0000000..3330b29
--- /dev/null
+++ b/src/exercises/151.reverse-words-in-a-string.py
@@ -0,0 +1,49 @@
+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+# @leet imports end
+
+# @leet start
+class Solution:
+    def reverseWords(self, s: str) -> str:
+        s = s.split(" ")
+        a = [""] * len(s)
+        j = len(a) - 1
+        for i in range(len(s)):
+            if s[i] != "":
+                a[j] = s[i]
+                j -= 1
+        return " ".join(a).strip()
+# @leet end
diff --git a/src/exercises/169.majority-element.py b/src/exercises/169.majority-element.py
index 164f941..d4f5a84 100644
--- a/src/exercises/169.majority-element.py
+++ b/src/exercises/169.majority-element.py
@@ -43,6 +43,5 @@ class Solution:
        nums.sort() 
        return nums[len(nums)//2]
 
-
 # @leet end
 
diff --git a/src/exercises/2016.maximum-difference-between-increasing-elements.py b/src/exercises/2016.maximum-difference-between-increasing-elements.py
new file mode 100644
index 0000000..231a060
--- /dev/null
+++ b/src/exercises/2016.maximum-difference-between-increasing-elements.py
@@ -0,0 +1,56 @@
+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+
+# @leet imports end
+
+
+# @leet start
+class Solution:
+    def maximumDifference(self, nums: List[int]) -> int:
+        max_val = -1
+        for i in range(len(nums)):
+            j = len(nums) - 1
+            while j > i:
+                if nums[i] < nums[j]:
+                    diff = nums[j] - nums[i]
+                    max_val = max(diff, max_val)
+                j -= 1
+
+        return max_val
+
+
+# @leet end
+
diff --git a/src/exercises/243.shortest-word-distance.py b/src/exercises/243.shortest-word-distance.py
index df1a0c3..2f96a84 100644
--- a/src/exercises/243.shortest-word-distance.py
+++ b/src/exercises/243.shortest-word-distance.py
@@ -44,6 +44,7 @@ class Solution:
         pos1 = word_indices[word1]
         pos2 = word_indices[word2]
 
+        # Two-pointer traversal
         i, j = 0, 0
         min_distance = float("inf")
 
@@ -52,6 +53,7 @@ class Solution:
             index2 = pos2[j]
             min_distance = min(min_distance, abs(index1 - index2))
 
+            # Move the pointer pointing to the smaller index
             if index1 < index2:
                 i += 1
             else:
@@ -59,6 +61,5 @@ class Solution:
 
         return min_distance
 
-
 # @leet end
 
diff --git a/src/exercises/244.shortest-word-distance-ii.py b/src/exercises/244.shortest-word-distance-ii.py
index 98b29d3..409e0ff 100644
--- a/src/exercises/244.shortest-word-distance-ii.py
+++ b/src/exercises/244.shortest-word-distance-ii.py
@@ -54,6 +54,7 @@ class WordDistance:
             index2 = pos2[j]
             min_distance = min(min_distance, abs(index1 - index2))
 
+            # Move the pointer pointing to the smaller index
             if index1 < index2:
                 i += 1
             else:
diff --git a/src/exercises/245.shortest-word-distance-iii.py b/src/exercises/245.shortest-word-distance-iii.py
index 19a0e72..bee2eee 100644
--- a/src/exercises/245.shortest-word-distance-iii.py
+++ b/src/exercises/245.shortest-word-distance-iii.py
@@ -67,7 +67,5 @@ class Solution:
                 j += 1
 
         return min_distance
-
-
 # @leet end
 
diff --git a/src/exercises/246.strobogrammatic-number.py b/src/exercises/246.strobogrammatic-number.py
index b3b0a1c..8fdb1be 100644
--- a/src/exercises/246.strobogrammatic-number.py
+++ b/src/exercises/246.strobogrammatic-number.py
@@ -52,4 +52,3 @@ class Solution:
 
 
 # @leet end
-
diff --git a/src/exercises/26.remove-duplicates-from-sorted-array.py b/src/exercises/26.remove-duplicates-from-sorted-array.py
new file mode 100644
index 0000000..7919c3d
--- /dev/null
+++ b/src/exercises/26.remove-duplicates-from-sorted-array.py
@@ -0,0 +1,50 @@
+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+# @leet imports end
+
+# @leet start
+class Solution:
+    def removeDuplicates(self, nums: List[int]) -> int:
+        if not nums:
+            return 0
+        k = 0
+        for i in range(len(nums)):
+            if nums[i] != nums[k]:
+                k += 1
+                nums[k] = nums[i]
+        return k + 1   
+
+# @leet end
diff --git a/src/exercises/27.remove-element.py b/src/exercises/27.remove-element.py
new file mode 100644
index 0000000..74ebe6e
--- /dev/null
+++ b/src/exercises/27.remove-element.py
@@ -0,0 +1,47 @@
+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+# @leet imports end
+
+# @leet start
+class Solution:
+    def removeElement(self, nums: List[int], val: int) -> int:
+        k = 0
+        for i in range(len(nums)):
+            if nums[i] != val:
+                nums[k] = nums[i]
+                k += 1
+        return k
+# @leet end
diff --git a/src/exercises/271.encode-and-decode-strings.js b/src/exercises/271.encode-and-decode-strings.js
new file mode 100644
index 0000000..abb5def
--- /dev/null
+++ b/src/exercises/271.encode-and-decode-strings.js
@@ -0,0 +1,31 @@
+// @leet start
+/**
+ * Encodes a list of strings to a single string.
+ *
+ * @param {string[]} strs
+ * @return {string}
+ */
+var key = '$#@C$(){(($[]%^[$()${#${(}'
+var encode = function(strs) {
+    if (strs.length === 0) return [];
+    const encoded = strs.join(key);
+    return encoded;
+};
+
+/**
+ * Decodes a single string to a list of strings.
+ *
+ * @param {string} s
+ * @return {string[]}
+ */
+var decode = function(str) {
+    if (Array.isArray(str)) return str;
+    let decoded = str.split(key);
+    return decoded;
+};
+
+/**
+ * Your functions will be called as such:
+ * decode(encode(strs));
+ */
+// @leet end
diff --git a/src/exercises/28.find-the-index-of-the-first-occurrence-in-a-string.py b/src/exercises/28.find-the-index-of-the-first-occurrence-in-a-string.py
index c5bca72..1ae9a13 100644
--- a/src/exercises/28.find-the-index-of-the-first-occurrence-in-a-string.py
+++ b/src/exercises/28.find-the-index-of-the-first-occurrence-in-a-string.py
@@ -50,4 +50,3 @@ class Solution:
 
 
 # @leet end;
-
diff --git a/src/exercises/290.word-pattern.py b/src/exercises/290.word-pattern.py
index c9b5255..a7a8168 100644
--- a/src/exercises/290.word-pattern.py
+++ b/src/exercises/290.word-pattern.py
@@ -57,6 +57,4 @@ class Solution:
         return True
 
 
-
 # @leet end
-
diff --git a/src/exercises/347.top-k-frequent-elements.js b/src/exercises/347.top-k-frequent-elements.js
new file mode 100644
index 0000000..4a67b75
--- /dev/null
+++ b/src/exercises/347.top-k-frequent-elements.js
@@ -0,0 +1,30 @@
+// @leet start
+/**
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {number[]}
+ */
+var topKFrequent = function(nums, k) {
+    const setOfNumbers = {};
+    for (const num of nums) {
+        if (!setOfNumbers[num]) {
+            setOfNumbers[num] = 1;
+        } else {
+            setOfNumbers[num] = setOfNumbers[num] + 1;
+        }
+    }
+    const values = Object.values(setOfNumbers);
+    const keys = Object.keys(setOfNumbers);
+    let newArray = [];
+
+    for (let i = 0; i < keys.length; i++) {
+        newArray.push([keys[i], values[i]]);
+    }
+    newArray = newArray.sort((a, b) => {
+        return b[1] - a[1];
+    });
+    newArray = newArray.slice(0, k);
+    newArray = newArray.map((a) => Number(a[0]));
+    return newArray;
+};
+// @leet end
diff --git a/src/exercises/3582.generate-tag-for-video-caption.py b/src/exercises/3582.generate-tag-for-video-caption.py
new file mode 100644
index 0000000..7da0652
--- /dev/null
+++ b/src/exercises/3582.generate-tag-for-video-caption.py
@@ -0,0 +1,59 @@
+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+
+# @leet imports end
+
+
+# @leet start
+class Solution:
+    def generateTag(self, caption: str) -> str:
+        words = caption.strip().split(" ")
+        result = []
+
+        for i in range(len(words)):
+            clean = re.sub(r"[^a-zA-Z]", "", words[i])
+            if not clean:
+                continue
+            if i == 0:
+                result.append(clean.lower())
+            else:
+                result.append(clean[0].upper() + clean[1:].lower())
+
+        return ("#" + "".join(result))[:100]
+
+
+# @leet end
+
diff --git a/src/exercises/3583.count-special-triplets.py b/src/exercises/3583.count-special-triplets.py
new file mode 100644
index 0000000..f3cac70
--- /dev/null
+++ b/src/exercises/3583.count-special-triplets.py
@@ -0,0 +1,74 @@
+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+
+# @leet imports end
+
+
+# @leet start
+class Solution:
+    def specialTriplets(self, nums: List[int]) -> int:
+        j = 0
+        count_left = {}
+        count_right = {}
+        total = 0
+        for i in nums:
+            if i not in count_right:
+                count_right[i] = 1
+            else:
+                count_right[i] += 1
+
+        while j < len(nums) - 1:
+            count_right[nums[j]] -= 1
+            target = nums[j] * 2
+
+            left_count = count_left.get(target, 0)
+            right_count = count_right.get(target, 0)
+
+            total += left_count * right_count
+
+            # Update count_left with current value
+            if nums[j] not in count_left:
+                count_left[nums[j]] = 1
+            else:
+                count_left[nums[j]] += 1
+
+            j += 1
+
+        return total % (10**9 + 7)
+
+
+# @leet end
+
diff --git a/src/exercises/49.group-anagrams.js b/src/exercises/49.group-anagrams.js
new file mode 100644
index 0000000..1136826
--- /dev/null
+++ b/src/exercises/49.group-anagrams.js
@@ -0,0 +1,18 @@
+// @leet start
+/**
+ * @param {string[]} strs
+ * @return {string[][]}
+ */
+var groupAnagrams = function(strs) {
+    if (strs.length < 2) return [strs];
+    const map = {};
+    for (const str of strs) {
+        const key = str.split("").sort().join("");
+        if (!map[key]) {
+            map[key] = [];
+        }
+        map[key].push(str);
+    }
+    return Object.values(map);
+};
+// @leet end
diff --git a/src/exercises/58.length-of-last-word.py b/src/exercises/58.length-of-last-word.py
new file mode 100644
index 0000000..3ab3c2d
--- /dev/null
+++ b/src/exercises/58.length-of-last-word.py
@@ -0,0 +1,44 @@
+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+# @leet imports end
+
+# @leet start
+class Solution:
+    def lengthOfLastWord(self, s: str) -> int:
+        s = s.strip()
+        s = s.split(" ")
+        return len(s[-1])
+# @leet end
diff --git a/src/exercises/70.climbing-stairs.js b/src/exercises/70.climbing-stairs.js
new file mode 100644
index 0000000..79b6760
--- /dev/null
+++ b/src/exercises/70.climbing-stairs.js
@@ -0,0 +1,19 @@
+// @leet start
+/**
+ * @param {number} n
+ * @return {number}
+ */
+const fibonacci = (element, cache = []) => {
+            if (element === 0) return 0;
+            if (element === 1) return 1;
+            if (cache[element]) return cache[element];
+            cache[element] = fibonacci(element - 2, cache) + fibonacci(element - 1, cache);
+            return cache[element];
+            }
+var climbStairs = function(n) {
+    
+
+            const array = fibonacci(n + 1)
+            return array
+};
+// @leet end
diff --git a/src/exercises/74.search-a-2d-matrix.py b/src/exercises/74.search-a-2d-matrix.py
index 67e035b..c7efc9c 100644
--- a/src/exercises/74.search-a-2d-matrix.py
+++ b/src/exercises/74.search-a-2d-matrix.py
@@ -73,7 +73,5 @@ class Solution:
 
         isValid = bin_search(0, len(nums) - 1)
         return isValid != -1
-
-
 # @leet end
 
diff --git a/src/exercises/760.find-anagram-mappings.py b/src/exercises/760.find-anagram-mappings.py
new file mode 100644
index 0000000..0e84cab
--- /dev/null
+++ b/src/exercises/760.find-anagram-mappings.py
@@ -0,0 +1,57 @@
+# @leet imports start
+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+
+# @leet imports end
+
+
+# @leet start
+class Solution:
+    def anagramMappings(self, nums1: List[int], nums2: List[int]) -> List[int]:
+        numsList = {}
+        j = 0
+        for i in nums2:
+            if i not in numsList:
+                numsList[i] = j
+            j += 1
+
+        arr = []
+        for i in nums1:
+            arr.append(numsList[i])
+        return arr
+
+
+# @leet end
+