程序员面试金典——11.5找出字符串

Allenlzcoder

于 2018-04-26 09:09:25 发布

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分类专栏：程序员面试金典题目笔记文章标签：程序员面试金典找出字符串

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程序员面试金典——11.5找出字符串

Solution1：我的答案。加强版的二分查找，嘿嘿嘿

class Finder {
public:
    int findString(vector<string> str, int n, string x) {
        // write code here
        if(n  < 0)
            return -1;
        int low = 0, high = str.size() - 1;
        while(low <= high) {
            int mid = (low + high)/2;
            int low_mid = mid, high_mid = mid;
            if(str[mid] != "") {
                if(str[mid] == x)
                    return mid;
                else if(str[mid] < x)
                    low = mid + 1;
                else 
                    high = mid - 1;
            }
            else if(str[mid] == "") {
                while(str[low_mid] == "" && low_mid > low)
                    low_mid--;
                while(str[high_mid] == "" && high_mid < high)
                    high_mid++;
                if(str[low_mid] == x)
                    return low_mid;
                else if(str[low_mid] < x)
                    low = high_mid;
                else 
                    high = low_mid - 1;
            }
        }
        return -1;
    }
};