A 每个字符最多出现两次的最长子字符串 滑动窗口:枚举窗口的左边界,尽可能右移窗口的右边界。 (当然也可以暴力枚举) class Solution {public:int maximumLengthSubstring(string s) {vector<int> cnt(26);int res = 0;for (int l = 0, r = -1, n = s.size();; c
390.Which of these are valid Flashback Database recovery point parameters? (Choose all that apply.) A. SCN B. Timestamp C. Named recovery point D. Transaction ID E. Session ID Answer: ABC 答案解