| Sorting a Stack using push,pop,isEmpty and peek |
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| Implement 3 stacks in 1 array |
Medium
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| Implement insertion sort with stacks |
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| Order-agnostic Binary Search on Sorted Array |
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| Unique BSTs 3 - Count given node keys between m and n |
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| Check if an Array of Integers is Sorted |
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| Count frequency of target element in sorted array |
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| Count number of bits to be flipped to convert A to B |
Easy
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| Determine if a string has all unique characters |
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| Find floor of target element in a sorted array |
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| Find the nearest numbers that have same number of 1s for an integer |
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| Implement selection sort on stack |
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| List Combinations - Generate unique combinations from list selecting 1 element from each |
Medium
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| Longest Substring with K distinct characters |
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google
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| Maximum Pairwise Product 1 - Given only Positive Integers |
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| Remove duplicates from an unsorted linked list keeping only one instance |
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| Replace all spaces in c-style string with '%20' |
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| Rotate String Problem |
Easy
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amazon
apple
ebay
google
linkedin
microsoft
oracle
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| Set all bits of a number in a range equal to another number |
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| Swap odd and even bits in an integer |
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cisco
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| Find smallest letter greater than target in a sorted array of letters |
Easy
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linkedin
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| Find Common Elements in Two Sorted Linked Lists |
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| Find last modular node in linked list for given k |
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| Check if the length of a linked list is even or odd |
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| Array-based Trie Implementation |
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