Minimum Length of String After Deleting Similar Ends LeetCode solution in C++

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class Solution {
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 public:
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  int minimumLength(string s) {
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    int i = 0, j = s.length() - 1;
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    while (i < j) {
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      if (s[i] != s[j]) {
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        break;
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      } else {
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        char x = s[i];
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        while (s[i] == x) {
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          i++;
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        }
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        if (i > j) {
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          return 0;
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        }
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        while (s[j] == x) {
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          j--;
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        }
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        if (j < i) {
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          return 0;
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        }
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      }
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    }
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    return j - i + 1;
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  }
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};