Delete Leaf Nodes With Value X
For the given binary tree, and X = 3:
The first line contains an integer T, the number of test cases. Then T cases follow. For each test case, the first line contains input in the level order form. The input consists of values of nodes separated by a single space in a single line. In case a node is null, we take -1 in its place. The second input line contains integer X, the value to be deleted. For example, the input for the tree depicted in the below image would be :
1 2 3 4 -1 5 6 -1 7 -1 -1 -1 -1 -1 -1
Level 1 : The root node of the tree is 1 Level 2 : Left child of 1 = 2 Right child of 1 = 3 Level 3 : Left child of 2 = 4 Right child of 2 = null (-1) Left child of 3 = 5 Right child of 3 = 6 Level 4 : Left child of 4 = null (-1) Right child of 4 = 7 Left child of 5 = null (-1) Right child of 5 = null (-1) Left child of 6 = null (-1) Right child of 6 = null (-1) Level 5 : Left child of 7 = null (-1) Right child of 7 = null (-1) The first not-null node (of the previous level) is treated as the parent of the first two nodes of the current level. The second not-null node (of the previous level) is treated as the parent node for the next two nodes of the current level and so on. The input ends when all nodes at the last level are null (-1).
The above format was just to provide clarity on how the input is formed for a given tree. The sequence will be put together in a single line separated by a single space. Hence, for the above-depicted tree, the input will be given as: 1 2 3 4 -1 5 6 -1 7 -1 -1 -1 -1 -1 -1
For each test case, in a new output line, print the inorder traversal of the tree.
You don't need to print anything. Just make the changes in the given tree itself and return the root of the updated tree.
1 <= T <= 100 0 <= N <= 3*10^3 1 <= A <= 10^5 1 <= X <= 10^5 Time limit: 1sec
We do a depth-first traversal to travel the tree :
Distance to a Cycle in Undirected Graph