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in this video well go over lead code question number 217 contains duplicate given an array we have to return true if any value appears at least twice in the array and false if every element is distinct now one way to do this would be to compare every element in the array with each other and return true if we find any duplicates for example lets say this is the array of numbers then first we compare one with every element in the array starting with 2 then 3 and so on now that we know that there are no duplicate ones in the array well move on to two we already compared 1 and 2 here and we dont need to compare two to itself so well start with 3 then 4 then 5. we didnt see any duplicate twos so now using the same logic well look at row 3. then row four we dont need to do this last row because all the comparisons with 5 have already been done here at this point we verified that there are no duplicates in the array and we would return false now this approach works but the problem is