Answer Posted / deepak

/*
you can also do some pre tests like array length should be odd.

just take an XOR of all the numbers it will give u the
number that occured single time.

it assumes that data is in correct form i.e. there is one
and only one number that occurs once.
*/
public static int whoOccursSingleTime(int a[]){
int s=0;
for(int i=0;i<a.length;i++){
s=s^a[i];
}
return s;
}

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