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#include "leetcode.h"
class Iterator {
struct Data;
Data *data;
public:
Iterator(const vector<int> &nums);
Iterator(const Iterator &iter);
int next();
bool hasNext() const;
};
class PeekingIterator : public Iterator {
public:
int nextVal;
PeekingIterator(const vector<int> &nums) : Iterator(nums) {
nextVal = Iterator::next();
}
int peek() { return nextVal; }
int next() {
int tmp = nextVal;
if (Iterator::hasNext())
nextVal = Iterator::next();
else
nextVal = NULL;
return tmp;
}
bool hasNext() const { return (nextVal != NULL); }
};
int main() {}
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