bytedance | Software Engineer | Interview Experience
Interview Date: Not specified
Result: Not specified
Difficulty: Not specified
Interview Process
The interview consisted of an online assessment with four questions in total, increasing in difficulty.
Technical Questions
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Interval Problem
A team of astronauts on a spaceship is receiving important data from Earth for their research. The data is being transmitted in segments that define a byte range in the form of a two-dimensional array. For each segment (L), the range is given in an array of two 64-bit integers: segment[0] is the index of the first byte, and segment[1] is the index of the last byte (both indices are inclusive). The task is to calculate the total number of unique bytes received for the entire file after each segment is received, considering that segments can overlap or completely replicate previous segments. -
Matrix Transformation
You are a molecular biologist working in a research laboratory that studies protein folding patterns. You have a square matrix representing a microscopic view of a protein structure, where each cell contains one of three possible molecular states: 0 (inactive), 1 (partially active), or 2 (fully active). Your task is to determine the minimum number of molecular state changes required to transform the current protein matrix into one that exhibits a stable “Y-shaped molecular pathway.” The Y-pattern is achieved when all molecular states along the diagonals from the upper-left and upper-right corners down to the center are identical, and all other molecular states (the background) are identical to each other but different from the Y-pattern states.
Tips & Insights
- Focus on understanding how to manage overlapping segments in the interval problem.
- Familiarize yourself with matrix manipulation and state transformation techniques for the matrix problem.