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0380.cpp
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0380.cpp
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class RandomizedSet {
unordered_set<int> s;
public:
RandomizedSet() {
ios_base::sync_with_stdio(0);
cin.tie(0);
}
bool insert(int val) {
if(s.count(val) != 0)
return false;
s.insert(val);
return true;
}
bool remove(int val) {
if(s.count(val) == 0)
return false;
s.erase(val);
return true;
}
int getRandom() {
auto it = s.begin();
int place = rand() % s.size();
advance(it, place);
return *it;
}
};
/**
* Your RandomizedSet object will be instantiated and called as such:
* RandomizedSet* obj = new RandomizedSet();
* bool param_1 = obj->insert(val);
* bool param_2 = obj->remove(val);
* int param_3 = obj->getRandom();
*/