Move Pieces to Obtain a String LeetCode solution in C++

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class Solution {
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 public:
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  bool canChange(string s, string t) {
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    int i = 0, j = 0, n = s.size(), m = t.size();
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    if (n != m) return false;
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    while (i < n || j < m) {
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      while (i < n && s[i] == '_') i++;
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      while (j < m && t[j] == '_') j++;
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      if (s[i] != t[j]) return false;
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      if (s[i] == 'R' && i > j) return false;
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      if (s[i] == 'L' && i < j) return false;
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      i++, j++;
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    }
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    return true;
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  }
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};