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#include "leetcode.h"
class RandomizedSet {
public:
bool insert(int val) {
if (data.count(val))
return false;
data[val] = idxs.size();
idxs.push_back(val);
return true;
}
bool remove(int val) {
if (!data.count(val))
return false;
int lst = idxs.back(), pos = data[val];
data[lst] = pos;
idxs[pos] = lst;
data.erase(val);
idxs.pop_back();
return true;
}
int getRandom() { return idxs[rand() % idxs.size()]; }
private:
unordered_map<int, int> data;
vector<int> idxs;
};
int main() {
RandomizedSet *obj = new RandomizedSet();
bool param_1 = obj->insert(2);
bool param_2 = obj->remove(1);
int param_3 = obj->getRandom();
cout << "param_1 (insert 2): ";
if (param_1)
cout << "true\n";
else
cout << "false\n";
cout << "param_2 (remove 1): ";
if (param_2)
cout << "true\n";
else
cout << "false\n";
cout << "param_3 (getRandom): " << param_3;
}
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