Minimum Sum of Four Digit Number After Splitting Digits LeetCode solution in C++

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class Solution {
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 public:
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  int minimumSum(int num) {
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    string s = to_string(num);
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    sort(s.begin(), s.end());
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    int res = (s[0] - '0' + s[1] - '0') * 10 + s[2] - '0' + s[3] - '0';
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    return res;
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  }
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};