12. [Leet Code 283 Move Zeros](https://leetcode.com/problems/move-zeroes/solution/) | [Solution](./level_easy/LeetCode_283_MoveZeros_1.ts) | [Solution 2](./level_easy/LeetCode_283_MoveZeros_2.ts)

13. [Leet Code 70 Climbing Stairs](https://leetcode.com/problems/climbing-stairs/) | [Solution DP Top Down](./level_easy/LeetCode_70_Climbing_Stairs_Easy.ts) | [Solution DP Bottoms Up](level_easy/LeetCode_70_Climbing_Stairs_1_Easy.ts)

14. [Leet Code 200 Number of Islands](https://leetcode.com/problems/number-of-islands/) | [Solution 1 DFS](./level_medium/LeetCode_200_NumberOfIslands.ts) | [Solution BFS](./level_medium/LeetCode_200_NumberOfIslands_1.ts) | [Solution Union Find](./level_medium/LeetCode_200_NumberOfIslands_2.ts)

* [Solution Dynamic Programming Bottoms Up](./dynamic_programming/MinCoinChange_2.ts)

8. Maximum Ribbon Cut

* [Solution Dynamic Programming Top Down](./dynamic_programming/MaximumRibbonCut_1.ts)