Login

All Problems

Problem title

Difficulty

Avg time to solve

LCA of three Nodes

Easy

20 mins

Sum Of Infinite Array

Moderate

35 mins

Pair Sum

Easy

15 mins

Sum or Product

Easy

15 mins

Yogesh And Primes

Moderate

20 mins

Find Duplicate in Array

Easy

15 mins

Reverse The Array

Easy

15 mins

Beautiful String

Easy

18 mins

Longest Univalue Path

Moderate

10 mins

Sort 0 1 2

Easy

22 mins

Problem

Submissions

192

Avg. time to solve

10 min

Success Rate

90%

Problem Statement

```
7
/ \
7 7
/ \ \
8 3 7
```

```
The first line of input contains an integer ‘T’ representing the number of test cases. Then the test cases follow.
The only line of each test case contains elements in the level order form. The line consists of values of nodes separated by a single space. 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
```

```
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, a single integer denoting the length of the longest path where each node in the path has the same value is printed.
The output for each test case is to be printed on a separate line.
```

```
You do not need to print anything; it has already been taken care of. Just implement the given function.
```

```
1 <= T <= 100
1 <= N <= 3000
-10^9 <= data <= 10^9 and data != -1
Where ‘T’ is the number of test cases, ‘N’ is the total number of nodes in the binary tree, and “data” is the value of the binary tree node.
Time Limit: 1sec
```

```
2
7 7 7 1 1 -1 7 -1 -1 -1 -1 -1 -1
10 3 4 3 3 -1 5 -1 -1 -1 -1 -1 -1
```

```
3
2
```

```
7
/ \
7 7
/ \ \
1 1 7
For the first test case, the length of the longest path where each node in the path has the same value is 3 and path is 7 -> 7 -> 7 -> 7.
10
/ \
3 4
/ \ \
3 3 5
For the second test case, the length of the longest path where each node in the path has the same value is 2 and path is 3 -> 3 -> 3.
```

```
2
1 4 5 4 4 -1 5 -1 -1 -1 -1 -1 -1
5 4 5 1 1 -1 5 -1 -1 -1 -1 -1 -1
```

```
2
2
```

Console

Sample Test Case

Custom Test Case

Download Test Cases

Test Case 1

Test Case 2

Test Case 3

Saving Code...

Full Screen Mode

Change Language

Change Theme

Solution submission not allowed

Save Code

Reset Code