Rearranged Sequence Output

What this C++ code-reading question tests

This is a medium-difficulty question that asks you to trace the behavior of a C++ program and predict its output. It assesses your understanding of language semantics, standard library containers, and how operations compose in sequence.

To solve code-reading problems like this, you need to carefully follow the flow of execution, track how data structures change at each step, and understand the precise behavior of library functions. Interviewers use these questions to verify that you think rigorously about code behavior rather than relying on intuition or guessing—a critical skill when debugging trading systems or implementing performance-sensitive algorithms where subtle semantic errors can be costly.

• Container manipulation and state changes
• Function side effects and return values
• Output stream behavior and formatting