practice problem 2#12

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abhipsa002 wants to merge 4 commits intomanuchandel:masterfrom

abhipsa002:hackerrank6

Commits on Oct 4, 2019

Add hackerrank problem on Hashmap to Contributors list
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Add hackerrank problem on print odd and even characters to Contributors list
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Add Solve me first to Contributions
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Added Simple 1D array practice problem
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