Feature idea tracking bug

[taktoa]

• Incremental connected components computation using union-find
• Dynamic dominator computation (using this paper)
• Dynamic postdominators (just flip the inserted edges)
• Branchless (SIMD?) union-find for C/C++
• Roaring bitmap?
• Path minima data structure (link-cut tree?)
• LRU or ARC cache
• Union-split-find map
• PQ tree