Coding:
1. 140 wordbreak
2. 0-1 knapsack
3. 236 lca of tree
4. 204 count prime number
5. 72 edit distance
6. 210 course schedule
7. 450 delete node in bst
8. 136 single number
9. 34 first&last pos of element in sorted array
10. 545 boundary of tree
11. 314 binary vertical traversal
12. 437 path sum
13. 127 word ladder
14. 472 concatenated words
15. 380 + - random O(1)
16. 543 diameter of tree
17. 134 gas station
18. 139 140 word break
19. 215 kth largest element in array
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