717. 1-bit and 2-bit Characters

class Solution {
    public boolean isOneBitCharacter(int[] bits) {
        int ones = 0;
        int i = bits.length - 2;

        while (i > -1 && bits[i] == 1) {
            ones++;
            i--;
        }

        return ones % 2 == 0;
    }
}

1,1,...1,0,..._count_ones_...,0
count_ones = 2i + 1 => last is two bit   - 10