Final Value of Variable After Performing Operations LeetCode solution in C++

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class Solution {
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 public:
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  int finalValueAfterOperations(vector<string> &o, int c = 0) {
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    for (auto &i : o)
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      if (i == "++X" or i == "X++")
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        c++;
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      else
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        c--;
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    return c;
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  }
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};