Leet Code # Problem Solution Difficulty 1 Two Sum Java Easy 2 Add Two Numbers Java Medium 4 Median of Two Sorted Arrays Java Hard 7 Reverse Integer Java Medium 9 Palindrome Number Java Easy 19 Remove Nth Node From End of List Java Medium 21 Merge Two Sorted Lists Java Easy 24 Swap Nodes in Pairs Java Medium 25 Reverse Nodes in k-Group Java Hard 26 Remove Duplicates from Sorted Array Java Easy 27 Remove Element Java Easy 28 Find the Index of the First Occurrence in a String Java Easy 41 First Missing Positive Java Hard 58 Length of Last Word Java Easy 83 Remove Duplicates from Sorted List Java Easy 153 Find Minimum in Rotated Sorted Array Java Medium 154 Find Minimum in Rotated Sorted Array II Java Hard 169 Majority Element Java Easy 206 Reverse Linked List Java Easy 237 Delete Node in a Linked List Java Medium 697 Degree of an Array Java Easy 1019 Next Greater Node in Linked List Java Medium 1402 Reducing Dishes Java Hard 2703 Return Length of Arguments Passed JavaScript Easy 2803 Insert Greatest Common Divisors in Linked List Java Medium 3136 Valid Word Java Easy