Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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write a java program Given a list of integers, return the starting index of the first pair that occurs. If there are no pairs in the list, return -1.
A pair consists of two consecutive integers having the same value. Three or more values in a row do NOT make or contain a pair.

Input Format

Input is two lines of data.
First line is n, the number of elements in the integer list.
Second line is the list of numbers.

Constraints

first line - n - will be between 2 and 1000000 the values will be any valid java integer values.

Output Format

output a single integer value - the index of the first element of the pair of value.
if no pair exists, then output -1

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