1. LRU cache (don't use LinkedHashMap)
2. a. Phone (with digit pad) letters combination -
   If you press 2& 3, the combinations will be ad,ae,af,bd,be,bf.
   b. Phone Search has already saved contacts, only show names those are present
3. (System) Design a Photo album/collage like app (Google photos)
   A. Discuss architecture
   B. Scale
   C. API Design
   D. Technology for upload of large files

Despite I did quite well, except in 2nd round I took little longer.
It was a Reject!