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  1. Prepare
  2. Mathematics
  3. Combinatorics
  4. Sherlock and Pairs
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Sherlock and Pairs

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  • alfruk
     + 0 comments
        in c++, remember to change the result variable in the main() function

            long long result = solve(a);

  • brewjunk
     + 0 comments
    from collections import Counter

def solve(a):
    c = Counter(a)
    count = 0
    for i in c.values():
        count += i*(i-1)
    return count

  • dingma129
     + 0 comments

    a python3 solution

    from collections import Counter
def solve(a):
    C = Counter(a)
    return sum(n*(n-1) for n in C.values())

  • rbpimenta
     + 0 comments

    For those who are trying in Java 8, you will need to change the given method to work with long and not int.

    You also need to change that in the main, that is automatically generated by Hacker Rank.

  • devcana15
     + 0 comments

    Can anyone help what is wrong with the following code. Only three out of 17 cases are working. https://www.hackerrank.com/challenges/sherlock-and-pairs/submissions/code/288605771

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