1: Given an array with duplicate numbers, return filtered array
2: Given an array of N elements containing 1 to N numbers, return a missing number
3: check if a word is a palindrome

Question

1: Given an array with duplicate numbers, return filtered array
2: Given an array of N elements containing 1 to N numbers, return a missing number
3: check if a word is a palindrome

Sigiloso · Accepted Answer

Pointer technique. All you need is either 1 or 2 pointers to achive O(n) run time and O(1) space

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