Harden vector two-pointer scan
Hard C++ arena: vectors, indices, sorted data, and overflow-safe sums
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Missing prerequisites: cpp-easy-vector-two-pointer
A telemetry service needs to count pairs under a latency budget. You are working inside a C++ performance arena, and the arena only clears when the result is safe, deterministic, and explainable.
Learn to apply vectors, indices, sorted data, and overflow-safe sums in a C++ performance arena while explaining the invariant, safety constraints, and hidden edge cases.
- Demonstrates vectors, indices, sorted data, and overflow-safe sums
- Handles the visible sample and hidden edge cases
- Keeps output deterministic and explainable
- Avoids unsafe dynamic execution
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