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Main.java
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Main.java
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package com.company;
import java.util.Iterator;
import java.util.List;
import java.util.Stack;
interface NestedInteger {
public boolean isInteger();
public Integer getInteger();
public List<NestedInteger> getList();
}
public class Main {
public static void main(String[] args) {
// write your code here
}
}
class NestedIterator implements Iterator<Integer> {
Stack<Integer> nums;
public NestedIterator(List<NestedInteger> nestedList) {
nums = new Stack<>();
dfs(nestedList);
}
private void dfs(List<NestedInteger> nestedList) {
for (int i = nestedList.size() - 1; i >= 0; i--) {
if(nestedList.get(i).isInteger())
nums.push(nestedList.get(i).getInteger());
else
dfs(nestedList.get(i).getList());
}
}
@Override
public Integer next() {
return nums.pop();
}
@Override
public boolean hasNext() {
return !nums.isEmpty();
}
}