- 040c (memo recursive, DP)
- 048b (a<=v<=b 数え上げ)
- 104c (bit greedy search)
- 108b (triangle rotation)
- 113c (dimension reduction)
- 114c (recursive, dfs)
- 115d (recursive)
- 116c (tower range)
- 122c (right-left)
- 125c (GCD, left-right)
- 128b
- 128c
- 138d dfs
- 139e dfs, topology
- 140d, RLE (Run Length Encoding)
- 143d, bisect
- 144c
- 146d, custom dfs
- 148e, double factorial
- 152d, count
- 75c, 120d, 157d, union-find
- 156d (mod)
- 159d, graph bsd
- 171e, xor
- 173c, bit
- 183d, imosu
- 188e, dag, dp
- 191e, dijkstra
- 029a dfs, bit, greedy
- 35a, XOR
- 36a, triangle, combination
- e, warshall floyd