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| 1 |[Two Sum](https://leetcode.com/problems/two-sum/)| Use a hash table to keep track of the indices of the numbers you've encountered so far. |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0001_two_sum.py)|[C++ Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/c%2B%2B_solutions/0001_two_sum.cpp)|
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| 24 |[Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/)| Implement both the iterative and recursive solution. What do we do if the linked list has an odd number of nodes? |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0024_swap_nodes_in_pairs.py)||
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| 56 |[Merge Intervals](https://leetcode.com/problems/merge-intervals/)| Sort the intervals by increasing start time. |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0056_merge_intervals.py)||
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| 66 |[Plus One](https://leetcode.com/problems/plus-one/)| Try iterating through each digit backwards. What do you do when the digit is a 9? |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0066_plus_one.py)||
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| 88 |[Merge Sorted Array](https://leetcode.com/problems/merge-sorted-array/)| Look at one element from each of the arrays, compare them, and make a decision depending on their relation to each other. |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0088_merge_sorted_arrays.py)||
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| 122 |[Best Time to Buy and Sell Stock II](https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/solution/)| What should we do every time there is a valley followed by a peak in price? |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0122_best_time_to_buy_and_sell_stock_II.py)||
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| 206 |[Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/)| Try a recursive solution. Split the list up into the first node and the rest of the list. |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0206_reverse_linked_list.py)||
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| 217 |[Contains Duplicate](https://leetcode.com/problems/contains-duplicate/)| Maintain a hash set that keeps track of the numbers we've encountered so far. |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0217_contains_duplicate.py)||
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| 344 |[Reverse String](https://leetcode.com/problems/reverse-string)| Use the two pointer approach. Try implementing an iterative and recursive solution. |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0344_reverse_string.py)||
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| 392 |[Is Subsequence](https://leetcode.com/problems/is-subsequence/)| Use two pointers to iterate through the two strings simultaneously. |[Python Solution](https://github.com/codethecoffee/leetcode-solutions/blob/master/python_solutions/0392_is_subsequence.py)||
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