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2 | 2 | | # | Title | Solutions | Time | Space | Difficulty | Tag | Notes |
3 | 3 | |-----|----------------|---------------|---------------|---------------|-------------|--------------|----- |
4 | 4 | |415|[Add Strings](https://leetcode.com/problems/add-strings/)|[Solution](../../blob/master/EASY/src/easy/AddStrings.java)| O(n)|O(1)| Easy| |
5 | | -|398|[Random Pick Index](https://leetcode.com/problems/random-pick-index/)|[Solution] | | | Medium| Reservoir Sampling |
| 5 | +|398|[Random Pick Index](https://leetcode.com/problems/random-pick-index/)|[Solution](../../blob/master/MEDIUM/src/medium/RandomPickIndex.java) | | | Medium| Reservoir Sampling |
6 | 6 | |397|[Integer Replacement](https://leetcode.com/problems/integer-replacement/)|[Solution](../../blob/master/EASY/src/easy/IntegerReplacement.java)| ? | ? | Easy| BFS |
7 | 7 | |396|[Rotate Function](https://leetcode.com/problems/rotate-function/)|[Solution](../../blob/master/EASY/src/easy/RotateFunction.java)| O(n^2) could be optimized to O(n)| O(1)| Easy| |
8 | 8 | |390|[Elimination Game](https://leetcode.com/problems/elimination-game/)|[Solution](../../blob/master/MEDIUM/src/medium/EliminationGame.java)| O(logn)|O(1)| Medium| |
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