Tree Sum of elements
Execution time limit is 1 second
Runtime memory usage limit is 128 megabytes
Binary tree is given. Find the sum of values in all its nodes.
Definition of a tree:
// Java
class TreeNode
{
public:
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
left = NULL;
right = NULL;
};
// C++
class TreeNode
{
public:
int val;
TreeNode *left;
TreeNode *right;
TreeNode(int x) : val(x), left(NULL), right(NULL) {}
};
Implement function Sum that returns the sum of values of all nodes in the tree.
// Java int Sum(TreeNode tree)
// C++ int Sum(TreeNode *tree)
Example
Function Sum returns value 45 - the sum 1 + 2 + 3 + 4 + 9 + 10 + 16 = 45.
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