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#include "leetcode.h"
class NestedIterator {
public:
NestedIterator(vector<NestedInteger> &nestedList) {
int n = nestedList.size();
for (int i = n - 1; i >= 0; --i)
nodes.push(nestedList[i]);
}
int next() {
int ans = nodes.top().getInteger();
nodes.pop();
return ans;
}
bool hasNext() {
while (!nodes.empty()) {
NestedInteger curr = nodes.top();
if (curr.isInteger())
return true;
nodes.pop();
vector<NestedInteger> &adj = curr.getList();
int n = adj.size();
for (int i = n - 1; i >= 0; --i)
nodes.push(adj[i]);
}
return false;
}
private:
stack<NestedInteger> nodes;
};
int main() {}
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