leetcode 28 Implement strStr()

代码语言：javascript复制

class Solution {
public:
    int strStr(string haystack, string needle) {
        if (needle.empty()) return 0;
        int m = haystack.size(), n = needle.size();
        if (m < n) return -1;
        for (int i = 0; i <= m - n;   i) {
            int j = 0;
            for (j = 0; j < n;   j) {
                if (haystack[i   j] != needle[j]) break;
            }
            if (j == n) return i;
        }
        return -1;
    }
};

leetcode

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