HackerRank Lonely Integer – Bash! problem solution

In this HackerRank Lonely Integer – Bash! problem solution There are N integers in an array A. All but one integer occur in pairs. Your task is to find the number that occurs only once.

Input Format

The first line of the input contains an integer N, indicating the number of integers. The next line contains N space-separated integers that form the array A.

Constraints

1 <= N < 100

N % 2 = 1 (N is an odd number)

0 <= A[i] <= 100, relate to [1,N]

Output Format

Output S, the number that occurs only once.

Problem solution.

tail -n 1 | awk '{split($0, r, " "); t=0; for (i in r) t=xor(t, r[i]); print t;}'

Second solution.

read N
read -a A
x=0
for i in "${A[@]}"
    do
        let " x ^= $i "
done
echo $x

Third solution.

#!/bin/bash

 read n
 read -a arr

x=${arr[0]};

for ((i=1;i<${#arr[@]};i++))
do
    x=$(($x ^  ${arr[$i]}));
    
done
echo $x;

Fourth solution.

read x
M=0
read r 
for N in $r
do   
M=$(($N ^ $M))
done
echo $M