[LeetCode] Longest Consecutive Sequence

int longestConsecutive(vector<int> &num) {    map<int, bool> map;for (int i = 0; i < num.size(); i++){map[num[i]] = true;}int maxLen = 0;for (int i = 0; i < num.size(); i++){if (map[num[i]] == true){int len = 1;int left = num[i] - 1;while (map.count(left) && map[left] == true){map[left] = false;len++;left--;}int right = num[i] + 1;while (map.count(right) && map[right] == true){map[right] = false;len++;right++;}maxLen = len > maxLen? len :maxLen;}}return maxLen;}