Given an array a of positive integers, find the number of pairs of integers for which the difference between the two numbers is equal to a given number k. Since the number of pairs could be quite large, take it modulo 109 + 7 for your output.
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What is modulo operation:
The remainder obtained after the division operation on two operands is known as modulo operation. Operator for doing modulus operation is ‘%’. For ex: a % b = c which means, when a is divided by b it gives the remainder c, 7%2 = 1, 17%3 = 2.
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