Leetcode 393 Solution

This article provides solution to leetcode question 393 (utf-8-validation)
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https://leetcode.com/problems/utf-8-validation

Solution

class Solution {
public:
    bool validUtf8(vector<int>& data) {
        for (int i = 0; i < data.size(); i++)
        {
            if ((data[i] & 0b10000000) == 0)
                continue;
            else if ((data[i] & 0b11100000) == 0b11000000)
            {
                if (i + 1 >= data.size())
                    return false;



                if ((data[i + 1] & 0b11000000) != 0b10000000)
                    return false;



                i++;
            }
            else if ((data[i] & 0b11110000) == 0b11100000)
            {
                if (i + 2 >= data.size())
                    return false;



                if ((data[i + 1] & 0b11000000) != 0b10000000 || (data[i + 2] & 0b11000000) != 0b10000000)
                    return false;



                i += 2;
            }
            else if ((data[i] & 0b11111000) == 0b11110000)
            {
                if (i + 3 >= data.size())
                    return false;



                if ((data[i + 1] & 0b11000000) != 0b10000000 || (data[i + 2] & 0b11000000) != 0b10000000 || (data[i + 3] & 0b11000000) != 0b10000000)
                    return false;



                i += 3;
            }
            else
                return false;
        }



        return true;
    }
};