Second largest element in an array

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Given an array (containing at most 1000 positive integers), find the second largest integer. If there exists no second largest integer, return-1, 

Input Specification:

 input1: length of the array input2: an array of positive integers 

Output Specification:

 Return the second largest number or-1 accordingly Example 1: input1: 3 input2: (2,1,2)..

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