X

DAYS

:

HOUR

:

MINS

:

SEC

Copied to Clipboard
Left View of Binary Tree
Easy Accuracy: 37.86% Submissions: 100k+ Points: 2

Given a Binary Tree, print Left view of it. Left view of a Binary Tree is set of nodes visible when tree is visited from Left side. The task is to complete the function leftView(), which accepts root of the tree as argument.

Left view of following tree is 1 2 4 8.

1
/     \
2        3
/     \    /    \
4     5   6    7
\
8

Example 1:

Input:
1
/  \
3    2
Output: 1 3



Example 2:

Input:

Output: 10 20 40


You just have to complete the function leftView() that returns an array containing the nodes that are in the left view. The newline is automatically appended by the driver code.

Expected Time Complexity: O(N).
Expected Auxiliary Space: O(Height of the Tree).

Constraints:
0 <= Number of nodes <= 100
1 <= Data of a node <= 1000

We are replacing the old Disqus forum with the new Discussions section given below.