Forgot READ.me

karanchawla · Jan 23, 2017 · 1db18a9 · 1db18a9
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+Assume we are giving a list of unorder consective ints. We have to find
+which int is missing. Since we know a single int is missing, we know
+that the original list must have a length of given list + 1. 
+Therefore, we sum all elements of range( lenght_of_given_list + 1) and 
+subtract the sum of all elements in the given list.