// 暴力解法
if (strs.length == 0) {
            return "";
        }
        if (strs.length == 1) {
            return strs[0];
        }
        if (strs[0].equals("")) {
            return "";
        }
        int n = strs.length;
        StringBuffer sb = new StringBuffer();
        int j = 0;
        ouur:
        while (true) {
            char t = strs[0].charAt(j);
            for (int i = 0; i < n; i++) {
                if (j >= strs[i].length()) {
                    break ouur;
                }
                if (t == strs[i].charAt(j)) {
                    if (i == n - 1)
                        sb.append(t);
                } else {
                    break ouur;
                }
            }
            j++;
            if (j >= strs[0].length()) {
                break;
            }
        }
        return sb.toString();