Prefix Constraints Ladder¶
Who This Is For¶
Use this ladder when a problem asks you to choose an optimal subset or ordering while every prefix must satisfy a capacity or balance rule.
Warm-Up¶
- threshold-feasibility ordering
- suffix-difference sanity checks
Core¶
- greedy with heap support
- exchange-argument style correctness
Example Notes¶
Exit Criteria¶
You are ready to move on when you can:
- express the prefix constraint clearly
- justify why the chosen greedy structure remains feasible at every step
- use a heap or ordered structure to repair choices efficiently
- distinguish this pattern from a full DP over prefixes