Now you are given an array of a characters (both ASCII and Kanji) and,
an index into the array. The index points to the start of some character.
Now you need to write a function to do a backspace (i.e. delete the
character before the given index).
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An array having 100 elements have numbers from 1 to 99 randomly out of which any number is repeated. Find the repeated number in minimum time and space complexity.
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