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717. 1-bit and 2-bit Characters--easy

2019-04-04 13:47:52  阅读:270  来源: 互联网

标签:index return 717 character two easy bit bits


We have two special characters. The first character can be represented by one bit 0. The second character can be represented by two bits (10 or 11).

Now given a string represented by several bits. Return whether the last character must be a one-bit character or not. The given string will always end with a zero.

Example 1:
Input:
bits = [1, 0, 0]
Output: True
Explanation:
The only way to decode it is two-bit character and one-bit character. So the last character is one-bit character.
Example 2:
Input:
bits = [1, 1, 1, 0]
Output: False
Explanation:
The only way to decode it is two-bit character and two-bit character. So the last character is NOT one-bit character.
Note:

1 <= len(bits) <= 1000.
bits[i] is always 0 or 1.

1.思考

  • 根据题意可知,遍历整个序列,若当前是0,则index++;若当前是1,则index = index + 2;
  • 直到序列最后两位,若倒数第二位为1,则index = index + 2,最后一位不是1bit,return false;
  • 若倒数第二位为0,则看最后一位是否为0,是则return true,否则return false;
  • 即当解码跳出循环时为index==len-1,且bits[index]==0,return true;否则,return false。

2.实现
Runtime: 4ms(100%)
Memory: 8.5MB(100%)


class Solution {
public:
    bool isOneBitCharacter(vector<int>& bits) {
        int len = bits.size();
        int i = 0;
        while(i<len-1){
            if(bits[i]==1)
                i++; 
            i++;
        }
        
        if(i==len-1 && bits[i]==0)
            return true;
        else
            return false;
    }
};

标签:index,return,717,character,two,easy,bit,bits
来源: https://www.cnblogs.com/xuyy-isee/p/10654398.html

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