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#include "leetcode.h"
class MyHashSet {
public:
vector<bool> ans;
MyHashSet() { ans.resize(1e6 + 1, false); }
void add(int key) { ans[key] = true; }
void remove(int key) { ans[key] = false; }
bool contains(int key) { return ans[key]; }
};
int main() {}
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