OddOccurrencesInArray

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problem

solution

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// you can use includes, for example:
// #include <algorithm>

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

int solution(vector<int> &A) {
    // write your code in C++14 (g++ 6.2.0)
    int ret = 0;
    for(int a:A) ret^=a;
    return ret;
}

analysis

  • time complexity O(n)
  • space complexity O(1)