Top Google Coding Interview Questions
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Problem Title
Difficulty
Avg Time to solve
Attempted
Convert binary tree to mirror tree
15
Easy
15 mins
645
Sorted Linked List to Balanced BST
14
Moderate
25 mins
462
Majority element
47
Easy
15 mins
4065
Next smaller Palindrome
12
Easy
10 mins
355
Evaluation of postfix expression
10
Easy
15 mins
505
Inplace rotate matrix 90 degree
15
Easy
12 mins
761
First and Last Position of an element in Sorted Array
37
Easy
20 mins
2963
Two Sum
328
Easy
10 mins
3917
Rod cutting problem
46
Moderate
40 mins
4592
Palindrome Partitioning
10
Moderate
25 mins
460
Distinct Subsequences
21
Moderate
10 mins
909
Valid Parentheses
33
Easy
10 mins
6003
Longest Consecutive Sequence
48
Moderate
40 mins
4084
N Queens
27
Hard
55 mins
610
Word Break-1
33
Moderate
36 mins
380
Valid Sudoku
153
Moderate
40 mins
1103
Replace ‘O’ With ‘X’
6
Moderate
35 mins
225
MergeSort Linked List
9
Moderate
30 mins
1258
Search In Rotated Sorted Array
111
Moderate
30 mins
6737
Edit Distance
20
Moderate
30 mins
2664
Colorful Knapsack
32
Hard
45 mins
631
Merge Intervals
42
Moderate
20 mins
1727
Gas Tank
5
Moderate
20 mins
1175
Longest Common Prefix
2
Moderate
30 mins
172
Shortest Path in a Binary Matrix
12
Moderate
37 mins
681
Convert binary tree to mirror tree
Easy
15 upvotes
Sorted Linked List to Balanced BST
Moderate
14 upvotes
Majority element
Easy
47 upvotes
Next smaller Palindrome
Easy
12 upvotes
Evaluation of postfix expression
Easy
10 upvotes
Inplace rotate matrix 90 degree
Easy
15 upvotes
First and Last Position of an element in Sorted Array
Easy
37 upvotes
Two Sum
Easy
328 upvotes
Rod cutting problem
Moderate
46 upvotes
Palindrome Partitioning
Moderate
10 upvotes
Distinct Subsequences
Moderate
21 upvotes
Valid Parentheses
Easy
33 upvotes
Longest Consecutive Sequence
Moderate
48 upvotes
N Queens
Hard
27 upvotes
Word Break-1
Moderate
33 upvotes
Valid Sudoku
Moderate
153 upvotes
Replace ‘O’ With ‘X’
Moderate
6 upvotes
MergeSort Linked List
Moderate
9 upvotes
Search In Rotated Sorted Array
Moderate
111 upvotes
Edit Distance
Moderate
20 upvotes
Colorful Knapsack
Hard
32 upvotes
Merge Intervals
Moderate
42 upvotes
Gas Tank
Moderate
5 upvotes
Longest Common Prefix
Moderate
2 upvotes
Shortest Path in a Binary Matrix
Moderate
12 upvotes
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