# RE8 | x-ai/grok-4.3 | run 1

## Prompt

Minimize total time to finish these tasks, one at a time, respecting dependencies: A (2h, no deps); B (3h, needs A); C (1h, no deps); D (2h, needs B and C). Give a valid order and the total time.

## Response

A valid sequence respecting all dependencies completes the tasks in exactly 8 hours, as all work must occur sequentially.  

Any topological order that places A before B and both B and C before D works; two minimal-time schedules are:  
- A (2 h), C (1 h), B (3 h), D (2 h)  
- C (1 h), A (2 h), B (3 h), D (2 h)  

Both finish at t = 8 h with no idle time.  

How would the schedule change if the tasks could run in parallel on multiple processors?
