Backtracking Patterns

12 backtracking problems covering subsets, permutations, and constraint satisfaction.

12 道題目

#	題目	難度	Rating
1	78. Subsets	Medium	1416
2	90. Subsets II	Medium	1517
3	46. Permutations	Medium	1519
4	47. Permutations II	Medium	1574
5	39. Combination Sum	Medium	1469
6	40. Combination Sum II	Medium	1562
7	77. Combinations	Medium	1483
8	17. Letter Combinations of a Phone Number	Medium	1460
9	22. Generate Parentheses	Medium	1648
10	79. Word Search	Medium	1700
11	131. Palindrome Partitioning	Medium	1615
12	51. N-Queens	Hard	1797