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Given a string S , output the count of number of substrings of length four such that every substring should contain unique characters in it
Given a string output the count of number of substrings of length four such that
every substring should contain unique characters in it If such substring exists,
output
Given an array of integers, output all the pairs of integers whose sum is equal to
Sum problem in Leetcode
Reverse the string without using extra variable and built in functions
Delete digits from a n digit number so that resulting number is minimum
Remove K digits problem in Leetcode give answer to the three qns in the image pls
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