Compare adjacent chars
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```csharp []
public class Solution {
    public int RemoveAlmostEqualCharacters(string word) {
        int idx = 1, len = word.Length, res = 0;
        if(len <= 1)
            return 0;

        while(idx < len)
        {
            if(Math.Abs(word[idx] - word[idx-1]) <= 1)
            {
                res++;
                idx++;
            }

            idx++;
        }

        return res;
    }
}
```
['C#']