Alternating Diameter Codechef Solution | May CHALLENGE


Alternating Diameter Codechef Solution

Chef stumbled upon BB black nodes and WW white nodes and now wants to construct a tree using them.

Chef is bamboozled by the total number of trees that can be constructed using these nodes. To reduce this count, Chef considered only those trees which have at least one diameter that has alternating colors i.e. a black node is followed by a white node and a white node is followed by a black node.

Help Chef in finding out the tree with the minimum possible diameter among all the trees that satisfies the above condition. If no tree satisfies the above conditions, print −1−1. If multiple trees satisfies the above condition, print any.

Input Format

  • The first line contains a single integer TT – the number of test cases. Then the test cases follow.
  • The first and only line of each test case contains two space separated integers B,WB,W representing the number of black and white nodes respectively.

Output Format

  • If a tree can be constructed that fulfils all the requirements then
    • In the first line, output a string of length B+WB+W in which the ithith character (1-based indexing) is either W or B denoting the colour of the ithith node as black or white respectively.
    • In the following B+W−1B+W−1 lines, output two integers UU and VV denoting an edge between UthUth and VthVth node.
  • If no tree fulfils the requirements print -1 in a single line.


  • 1≤T≤1001≤T≤100
  • 0≤B,W≤10000≤B,W≤1000
  • 1≤B+W≤10001≤B+W≤1000

Sample Input 1 

1 1
0 2
1 2

Sample Output 1 

2 1
1 2
2 3


Test case 11: The tree has only one path between the nodes 11 and 22 which is the diameter and also alternating in color. The checker will handle multiple possible answers so you can also swap the colors of the node to achieve the same result.

Test case 22: There is only one tree possible and its diameter would consist of all white nodes only. Therefore there is no tree which satisfies the given conditions.

Alternating Diameter Codechef  SOLUTION

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