Coding Interview Resources
This channel contains the free resources and solution of coding problems which are usually asked in the interviews. Managed by: @love_data
Show more📈 Analytical overview of Telegram channel Coding Interview Resources
Channel Coding Interview Resources (@crackingthecodinginterview) in the English language segment is an active participant. Currently, the community unites 52 232 subscribers, ranking 2 482 in the Technologies & Applications category and 6 824 in the India region.
📊 Audience metrics and dynamics
Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 52 232 subscribers.
According to the latest data from 27 August, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by 8 over the last 30 days and by 1 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 1.85%. Within the first 24 hours after publication, content typically collects 0.77% reactions from the total number of subscribers.
- Post reach: On average, each post receives 968 views. Within the first day, a publication typically gains 404 views.
- Reactions and interaction: The audience actively supports content: the average number of reactions per post is 2.
- Thematic interests: Content is focused on key topics such as array, stack, algorithm, programming, sort.
📝 Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
“This channel contains the free resources and solution of coding problems which are usually asked in the interviews.
Managed by: @love_data”
Thanks to the high frequency of updates (latest data received on 28 August, 2026), the channel maintains relevance and a high level of publication reach. Analytics show that the audience actively interacts with content, making it an important point of influence in the Technologies & Applications category.
document.getElementById()
⦁ document.querySelector()
⦁ element.innerHTML (sets HTML content), element.textContent (sets text only), element.style (applies CSS)
Example: document.querySelector('p').textContent = 'Updated text!';
4️⃣ Q: What is event handling in JavaScript?
A:
It allows reacting to user actions like clicks or key presses.
Example:
document.getElementById("btn").addEventListener("click", () => {
alert("Button clicked!");
});
5️⃣ Q: What are arrow functions?
A:
A shorter syntax for functions introduced in ES6.
const add = (a, b) => a + b;
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def length_of_longest_substring(s):
seen = set()
left = max_len = 0
for right in range(len(s)):
while s[right] in seen:
seen.remove(s[left])
left += 1
seen.add(s[right])
max_len = max(max_len, right - left + 1)
return max_len
22. Explain backtracking with N-Queens problem
Backtracking tries placing a queen in each column, then recursively places the next queen if safe. If no safe position is found, it backtracks.
python
def solve_n_queens(n):
result = []
board = [-1]×n
def is_safe(row, col):
for r in range(row):
if board[r] == col or abs(board[r] - col) == abs(r - row):
return False
return True
def backtrack(row=0):
if row == n:
result.append(board[:])
return
for col in range(n):
if is_safe(row, col):
board[row] = col
backtrack(row + 1)
board[row] = -1
backtrack()
return result
23. What is a trie? Where is it used?
A Trie is a tree-like data structure used for efficient retrieval of strings, especially for autocomplete or prefix matching.
Used in:
- Dictionary lookups
- Search engines
- IP routing
24. Explain bit manipulation tricks
- Check if number is power of 2: n & (n - 1) == 0
- Count set bits: bin(n).count('1')
- Swap without temp: x = x ^ y; y = x ^ y; x = x ^ y
25. Kadane’s Algorithm for maximum subarray sum
python
def max_subarray(nums):
max_sum = current = nums[0]
for num in nums[1:]:
current = max(num, current + num)
max_sum = max(max_sum, current)
return max_sum
26. What are heaps and how do they work?
Heap is a binary tree where parent is always smaller (min-heap) or larger (max-heap) than children. Supports O(log n) insert and delete.
Use Python’s heapq for min-heaps.
27. Find kth largest element in an array
python
import heapq
def find_kth_largest(nums, k):
return heapq.nlargest(k, nums)[-1]
28. How to detect cycle in a graph?
Use DFS with visited and recursion stack.
python
def has_cycle(graph):
visited = set()
rec_stack = set()
def dfs(v):
visited.add(v)
rec_stack.add(v)
for neighbor in graph[v]:
if neighbor not in visited and dfs(neighbor):
return True
elif neighbor in rec_stack:
return True
rec_stack.remove(v)
return False
for node in graph:
if node not in visited and dfs(node):
return True
return False
29. Topological sort of a DAG
Used to sort tasks with dependencies.
python
def topological_sort(graph):
visited, result = set(), []
def dfs(node):
if node in visited:
return
visited.add(node)
for neighbor in graph.get(node, []):
dfs(neighbor)
result.append(node)
for node in graph:
dfs(node)
return result[::-1]
30. Implement a stack using queues
python
from collections import deque
class Stack:
def init(self):
self.q = deque()
def push(self, x):
self.q.append(x)
for _ in range(len(self.q) - 1):
self.q.append(self.q.popleft())
def pop(self):
return self.q.popleft()
def top(self):
return self.q[0]
def empty(self):
return not self.q
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