@laurieontech did something really cool in JS with a bitwise XOR (her answer is above), so I figured I'd update this C++ answer with a bitwise XOR since I love it!
int stray(std::vector<int> numbers) { int r = numbers[0]; for (int i = 1; i < numbers.size(); i++) { r ^= numbers[i]; } return r; };
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@laurieontech did something really cool in JS with a bitwise XOR (her answer is above), so I figured I'd update this C++ answer with a bitwise XOR since I love it!