A non-empty array A consisting of N integers is given. The array contains an odd number of elements, and each element of the array can be paired with another element that has the same value, except ...

result = result ^ A[i]; // using XOR to find odd occurences. even occurences cancel themselves out. e.g: B^B = 0.

OddOccurrencesInArray at codility-com/programmers in PHP Explained: Find value that occurs in odd number of elements. Do not forget that you should be paid for reading this.

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