Google Internet company How hard is the interview for the OA alone has already dissuaded a wave of people. But in fact, as long as you master the question set and grasp the time allocation, OA is the first step to make a comeback. Today, with the help of the real experience of Programhelp students, we will take you to review the complete Google OA process + analysis of the real questions, and step on the point in advance!
Google OA Basics (for school recruiting / internship)
It's no exaggeration to say that Google OA is one of the few questions that "can test the original LeetCode questions and still get you thinking". The direction of the questions is relatively stable, but there are variations and twists, so it's very important to test your reaction on the spot.
| Content | Clarification |
|---|---|
| Platform | CodeSignal (mostly fresher positions) or Karat (biased towards in-service/senior) |
| Total duration | Typically 70 ~ 90 minutes |
| question structure | - Coding 2-3 courses - Plus some short answer or logic questions (occasionally) |
| Language Support | Python / Java / C++ etc. (most proficient recommended) |
| Difficulty distribution | Usually it's 1 Medium + 1 Hard, but there are cases of 2 Hard, so there's a lot of luck involved. |
| Whether to record and monitor | CodeSignal versions usually record the whole process + take photos for authentication. |
Real question restoration + solutions (high-frequency questions in the past two years)
Topic 1: Fill 2D Array Google OA 2025
Fill 2D Array Google OA
Given a N x N matrix. Fill the integers from 1 to n*n to this matrix that makes the sum of each row, each column and the two diagonals equal.
Example 1:
Input: n = 2
Output: null
Explanation: We need to fill [1, 2, 3, 4] into a 2×2 matrix, which is not possible so return null.
Example 2:
Input: n = 3
Output.
[[8, 3, 4],
[1, 5, 9],
[6, 7, 2]]
Explanation: We need to fill [1, 2, 3, ..., 9] into a 3×3 matrix. This is one way to do it
Each row [8, 3, 4] [1, 5, 9] [6, 7, 2] sum is 15.
Each column [8, 1, 6] [3, 5, 7] [4, 9, 2] sum is 15.
The two diagonals [8, 5, 2] [4, 5, 6] sum is 15.
int[][] fillMatrix(int n) {}
Topic 2: Largest Subarray Google OA 2025
Largest Subarray Google OA
Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.
A subarray is a contiguous part of an array.
Example 1:
Input: nums = [-2,1,-3,4,-1,2,1,-5,4]
Output: 6
Explanation: [4,-1,2,1] has the largest sum = 6.
Example 2:
Input: nums = [1]
Output: 1
Example 3:
Input: nums = [5,4,-1,7,8]
Output: 23
Topic 3: Maximum Area Serving Cake Google OA 2025
Maximum Area Serving Cake Google OA
Given an array containing the radii of circular cakes and the number of guests, determine the largest piece that can be cut from the cakes such that every guest gets a piece of the cake with the same area. It is not possible that a single piece has some part of one cake and some part of another cake and each guest is served only one piece of cake. It is not possible that a single piece has some part of one cake and some part of another cake and each guest is served only one piece of cake.
Example 1:
Input: radii = [1, 1, 1, 1, 2, 2, 3], numberOfGuests = 6.
Output: 7.0686
Explanation.
Reason being you can take the area of the cake with a radius of 3, and divide by 4. (Area 28.743 / 4 = 7.0686)
Use a similarly sized piece from the remaining cakes of radius 2 because total area of cakes with radius 2 are > 7.0686
Example 2:
Input: radii = [4, 3, 3], numberOfGuests = 3
Output: 28.2743
Example 3:
Input: radii = [6, 7], numberOfGuests = 12
Output: 21.9911
Topic 4: Compare Strings Google OA 2025
Compare Strings Google OA
One string is strictly smaller than another when the frequency of occurrence of the smallest character in the string is less than the frequency of occurrence of the smallest character in the comparison string.
For example, string "abcd" is smaller than string "aaa" because the smallest character (in lexicographical order) in "abcd" is 'a', with a frequency of 1, and the smallest character in lexicographical order) in "abcd" is 'a', with a frequency of 1, and the smallest character in "abcd" is smaller than string "aaa" because the smallest character (in lexicographical order) in "abcd" is 'a', with a frequency of 1, and the smallest character in "aaa" is also 'a', but with a frequency of 3.
In another example, string "a" is smaller than string "bb" because the smallest character in "a" is 'a' with a frequency of 1, and the smallest character in "bb" is 'b' with a frequency of 2.
Write a function that, given string A (which contains M strings delimited by ',') and string B (which contains N strings delimited by ','), returns an array C of N integers. delimited by ','), returns an array C of N integers. For 0 <= J < N, values of C[J] specify the number of strings in A which are strictly smaller than the comparison Jth string in B (starting from 0). strictly smaller than the comparison Jth string in B (starting from 0).
For example, given strings A and B such that.
Input.
A = "abcd,aabc,bd"
B = "aaa,aa"
Output.
[3, 2]
Explanation.
the function should return [3, 2], because.
All the strings in A are strictly smaller than "aaa" on the basis of the given comparison criteria.
Strings "abcd" and "bd" are strictly smaller than "aa".
Constraints.
1 <= N, M <= 10000
1 <= length of any string contained by A or B <= 10
All the input strings comprise only lowercase english alphabet letters (a - z)
Google Delivery Advice｜When to deliver & How to deliver more effectively?
Many students will ask: "Google should I vote early?" "Is internal promotion useful?" and "How long does it take to get an OA?" This side summarizes it for you 👇.
Recommendation one:Prepare early and deliver early
Google fall recruitment every year in July to August on the successive opening of the application portal, it is recommended to prepare a good resume as early as possible, in mid-July you can start to pay attention to. Early delivery means that you can receive OA earlier, and it is not easy to be backlogged or "batch rejected".
Recommendation two:Try to push inside for better hits
Inner push will be prioritized, and does not affect the normal process of follow-up, the success rate is generally a little higher than the official website self-submission. If you don't have an insider, you can find alumni, GitHub contact engineers.
Recommendation three:Job matching should be precise
If you are a fresher, it is recommended to prioritize the "University Grad" / "SWE Intern" type of position, the system is easier to tag and identify. Before submitting, align the keywords in your resume (project name, tech stack) with the position JD as much as possible to improve the match.
Tips: After submitting your resume, the OA is usually sent out within 1~3 weeks, so be patient and wait for the email from HR. If there is no movement for more than 3 weeks, it is recommended to follow up or change the way to submit your resume.
Programhelp Help you efficiently sprint Google OA
As an old friend in the field of interview assistance, we have successfully assisted dozens of students to pass Google OA and take offers from tech giants such as Google / Meta / Amazon etc. we offer:
Latest Google High-Frequency OA Real Questions + Explanation of Sub-questions
Coding Mockups + Karat Video Interview Walkthroughs
High-score strategy disassembled (how to get full score / optimize code structure)
OA Remote Assist Service (Question Analysis / Answer Idea Guide)
If you are also preparing for Google OA, feel free to private message us for sample questions & one-on-one coaching scheduling!
