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NestedListdepthSum.java
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NestedListdepthSum.java
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/**
* // This is the interface that allows for creating nested lists.
* // You should not implement it, or speculate about its implementation
* public interface NestedInteger {
* // Constructor initializes an empty nested list.
* public NestedInteger();
*
* // Constructor initializes a single integer.
* public NestedInteger(int value);
*
* // @return true if this NestedInteger holds a single integer, rather than a nested list.
* public boolean isInteger();
*
* // @return the single integer that this NestedInteger holds, if it holds a single integer
* // Return null if this NestedInteger holds a nested list
* public Integer getInteger();
*
* // Set this NestedInteger to hold a single integer.
* public void setInteger(int value);
*
* // Set this NestedInteger to hold a nested list and adds a nested integer to it.
* public void add(NestedInteger ni);
*
* // @return the nested list that this NestedInteger holds, if it holds a nested list
* // Return empty list if this NestedInteger holds a single integer
* public List<NestedInteger> getList();
* }
*/
/*
Runtime: 0 ms, faster than 100.00% of Java online submissions for Nested List Weight Sum.
Memory Usage: 39.8 MB, less than 91.07% of Java online submissions for Nested List Weight Sum.
*/
class NestedListdepthSum {
public int depthSum(List<NestedInteger> nestedList) {
return findDepth(nestedList,1);
}
public int findDepth(List<NestedInteger> nestedList,int depth)
{
int dsum=0;
for(NestedInteger i:nestedList)
{
if(i.isInteger())
{
dsum+=i.getInteger()*depth;
}
else
{
int sum=findDepth(i.getList(),depth+1);
dsum+=sum;
}
}
return dsum;
}
}