Phase 5 / graphs/parity/path_reversal
Phase 6 / graph/degree-parity
Phase 4 / dp, parity, combinatorics
Phase 5 / dp, grid, parity
Phase 6 / graphs, shortest paths, parity
Phase 3 / array-partition
Phase 1 / graph, parity, dp
Phase 1 / mst, parity, union_find
Phase 1 / sliding_window, parity