Speaking of "ceilings" in the tech world.Google Internet company Definitely on the list. Its interview process is known for its strong systematic, tricky questions and strict logic, and many students will feel anxious before the interview. But in fact, Google interview is not impossible to overcome the "king of the devil off" - as long as you master the correct preparation method, brush through the high-frequency questions in advance, understand the design intention behind the question, you can greatly enhance the pass rate!
In this post, we will share several high-frequency questions (covering Coding & System Design) that really appeared in Google interviews, and combine them with our students' experience in answering the questions to provide you with a detailed analysis and idea disassembly, which will help you not to step on the pits in interviews, and secure Tech Giant Offer!
Round 1: BQ Round
Tell me about a team project you worked on
Tell me about a time when your behavior hinders the project.
Tell me about a time you work with insufficient information
Tell me about a time you worked with a tight deadline
Tell me about a time your initial proposal didn't work and you changed the planTell me about a conflict with your coworkers
Round 2: Coding
Given the root node of a binary tree, on each row of the binary tree may be either 0 or 1. where neighboring 1s can be combined to form islandsPlease tell me how many different kinds of islands are there?
Solution.
Recursion from root node
base case.
If the current node is None, return 0.
Sub-issues.
Recursive left and right subtree, the number of islands in the left and right subtree, numLeft on behalf of the number of islands in the left subtree, numRight on behalf of the number of islands in the right subtree, merge: if root.data == 0, return directly, numLeft + numRight. because at this time the islands in the left and right subtree have no effect on each other, if root.data == 1, then you need to consider the weights of the right and left subtree. At this point you need to consider the weights of the left and right subtrees.
Neither left nor right child node is empty and both are 1,then the current root node will be merged with an island from the left or right subtree, so the total number of islands needs to be -1
If the left child node is empty or has weight 0 and the right child node is empty or has weight 0, then the current root node forms a new island
Otherwise, the number of islands remains the same, numLeft+numRight.
Follow up: Find the number of islands of different sizes.
Round 3: Coding
Starting from a given key key, find whether the path can form the target word by moving with certain rules. The move distance cannot exceed k. The Manhattan distance formula is |x1 - x2| + |y1 - y2|.
Search for the path to the target term using BFS or DFS:
If the next character can be reached, update the current position and continue trying for the next character.
Get the coordinates of start_pos, starting from the start key.
Attempts to access the next characters one by one in the order of the target word.
At each step, check: whether the next character is within k steps (calculate the Manhattan distance). Returns false if out of range.
Round 4: Coding
You start with an array full of N zeros and want to get an array A. In a single move, you can choose any interval and increment all elements within that interval by 1. For example, you can convert [0,0,0,0] to [0,1,1,1,0] in one move. However, you need three steps to get [1,0,1,2,2]. A possible sequence of moves is: [0,0,0,0,0,0] → [0,0,1,1,1] → [0,0,1,2] → [1,0,1,2,2], where → denotes a single move. What is the minimum number of moves required to obtain A, starting from a zero-populated array?
Key Points:
To minimize the number of operations, the goal should be to cover as many elements as possible with each operation while trying to boost all values in the target array.
The effect of each operation is similar to a "local addition" to an array, where we can analyze the change in value at each position to determine which subarrays need to be added.
Intuitive Methods:
If the value in the target array AAA increases (from A[i]A[i]A[i] to A[i+1]A[i+1]A[i+1]), it means that a new operation is needed to raise the value.
If the values in the target array AAA fall or remain unchanged, no additional operations are required, only the cumulative impact of the previous ones is maintained.
Brush up on millions of questions, the ideas are the most important.
Google's interviews are never just about algorithms, but also about your understanding of the nature of the problem and your ability to solve complex system problems. If you are still preparing for the test alone, you may want to contact Programhelp Our team comes from Oxford, Princeton, and Peking University, and now works in Amazon, Byte and other first-tier big factories, focusing on the whole process of coaching, such as OA ghostwriting, VO technical assistance, system design accompaniment, and mock interviews.
From the direction of brushing questions, systematic explanation to practical assistance, 1v1 efficiently take flight to help you get your dream offer!
