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Difficulty: EASY

Avg. time to solve

10 min

Success Rate

90%

Problem Statement

Suggest Edit

```
1. Do not print anything, just return the length of the longest consecutive path in the binary tree.
```

```
The first line contains an Integer 't' which denotes the number of test cases or queries to be run. Then the test cases follow.
The first line of input contains the elements of the tree in the level order form separated by a single space.
If any node does not have left or right child, take -1 in its place. Refer to the example below.
Example:
Elements are 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 on its place.
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
Explanation :
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, return a single integer denoting the number of nodes in the Longest increasing Consecutive Path.
```

```
1 <= T <= 100
1 <= N <= 3000
Where ‘T’ is the total number of test cases and ‘N’ is the number of nodes in the given binary tree.
Time limit: 1 second
```

```
2
6 4 7 -1 -1 -1 8 9 -1 -1 -1
1 2 3 4 5 6 7 - 1 -1 -1 -1 -1 -1 -1 -1
```

```
4
2
```

```
Test Case 1:
The tree is:
```

```
We can clearly see that the longest path has the length 4 (6->7->8->9) hence we return 4.
Test Case 2:
The Tree is:
```

```
We can see that the longest consecutive sequence, in this case, has length 2 i.e 1->2.
Therefore we return 2
```

```
2
1 2 9 3 4 5 6 4 -1 -1 -1 -1 -1 -1 -1 -1 -1
10 11 -1 12 -1 13 -1 16 -1 17 -1 38 -1 14 -1 -1 -1
```

```
4
7
```

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