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HackerRank - Handshake Python Solution

HackerRank - Handshake Python Solution

Beeze Aal
Beeze Aal

At the annual meeting of Board of Directors of Acme Inc, every one starts shaking hands with everyone else in the room. Given the fact that any two persons shake hand exactly once, Can you tell the total count of handshakes?

Input Format
The first line contains the number of test cases T, T lines follow.
Each line then contains an integer N, the total number of Board of Directors of Acme.

Output Format

Print the number of handshakes for each test-case in a new line.


1 <= T <= 1000
0 < N < 106

Sample Input


Sample Output



Case 1 : The lonely board member shakes no hands, hence 0.
Case 2 : There are 2 board members, 1 handshake takes place.

Solution in Python


import os
import sys

# Complete the handshake function below.
def handshake(n):
    return sum(range(n))

if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    t = int(input())

    for t_itr in range(t):
        n = int(input())

        result = handshake(n)

        fptr.write(str(result) + '\n')