Check if the Sentence Is Pangram LeetCode solution in C++

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class Solution {
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 public:
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  bool checkIfPangram(string sentence) {
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    vector<int> v(26, 0);
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    for (auto x : sentence) {
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      v[x - 'a'] = 1;
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    }
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    return accumulate(begin(v), end(v), 0) == 26;
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  }
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};