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| int lonelyinteger(vector<int> a) { | |
| int result = 0; | |
| // for each element if result is equal to start of line then result is set to that value. | |
| for (int i : a) | |
| { | |
| result = result ^ i; | |
| } | |
| return result; | |
| } |
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Input: [1, 2, 3, 4, 3, 2, 1]
Returns: 4