Some more problems:
More BFS on graph
- Medium i618. Search Graph Nodes https://www.lintcode.com/problem/618/
More BFD on Matrix
- i598. Zombie in Matrix https://www.lintcode.com/problem/598/
- i573. Build Post Office II https://www.lintcode.com/problem/573/
- i1179. Friend Circles https://www.lintcode.com/problem/1179/ BFS / Union Find