Phase 5 / graphs, degree, greedy
Phase 5 / graphs, shortest paths
Phase 6 / graph/grid/shortest-path
Phase 6 / graphs, shortest paths, parity
Phase 5 / graph_theory, connectivity
Phase 2 / Graphs, Bridges
Phase 2 / Graphs, Bitmask Dijkstra
Phase 2 / DSU, Offline Processing
Phase 1 / dijkstra, optimization