vector<int>nums; unordered_map<int, priority_queue<int>>m; }; 有网友指出上面的方法其实不是真正的 O(1) 时间复杂度,因为优先队列的 push 不是常数级的,博主一看果然是这样的,为了严格的遵守 O(1) 的时间复杂度,我们将优先队列换成 unordered_set,其插入删除的操作都是常数量级的,其他部分基本不用变...
dataMap.put(val, idxSet); } idxSet.add(dataList.size()); dataList.add(val); return idxSet.size() == 1; } /** Removes a value from the collection. Returns true if the collection contained the specified element. */ public boolean remove(int val) { TreeSet<Integer> idxSet = data...
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classRandomizedCollection{public:/** Initialize your data structure here. */RandomizedCollection(){}/** Inserts a value to the collection. Returns true if the collection did not already contain the specified element. */boolinsert(intval){m[val].insert(nums.size());nums.push_back(val);returnm...
@returns: yields an unordered list of tag names ''' seen = set() for elt in self._etree.getiterator(TAG): name = elt.text if not name in seen: seen.add(name) yield name.lstrip('@') def _get_heading_element(self, level=1): root = self._etree.getroot() children = root...
insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the set if present. getRandom: Returns a random element from current set of elements. Each element must have the same probability of being returned. ...
Can't load project because root element is missing? Can't send mail by connecting to remote SMTP server Can't start webapplication with local development server after .NET 4.0 upgrade Cannot add a column named 'serial': a nested table with the same name already belongs to this DataTable ca...
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A set is a data structure that can store elements and has no repeated values. It is a computer implementation of the mathematical concept of a finite set. Unlike most other collection types, rather than retrieving a specific element from a set, one typically tests an element for membership in...
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