#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 data; vector 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; }