Single Number XOR

Easy

Python

def single_number(nums):
    r=0
    for n in nums: r^=n
    return r

Java

public int singleNumber(int[] nums){
    int r=0;
    for(int n:nums) r^=n;
    return r;
}

Most identical Python-Java solution.

Python

def single_number(nums):
    r=0
    for n in nums: r^=n
    return r

Java

public int singleNumber(int[] nums){
    int r=0;
    for(int n:nums) r^=n;
    return r;
}

1. XOR all
2. Duplicates cancel