Leetcode 717. 1-bit and 2-bit Characters

class Solution {
public:
    bool isOneBitCharacter(vector<int>& bits) {
        int step = 1;
        int index = 0;
        while(index < bits.size()) {
            step = bits[index]==1?2:1;
            index += step;
        }
        return step == 1;
    }
};