- Time limit: 1.00 s
- Memory limit: 256 MB
You are given a simple, undirected graph that consists of n nodes and m edges.
Your task is to paint each node red or blue so that there are at least \lfloor m/2 \rfloor edges such that their nodes have a different color.
The first input line contains an integer t: the number of test cases. After this, there are t test cases that are described as follows:
The first line contains two integers n and m: the number of nodes and edges in the graph. The nodes are numbered 1,2,\ldots,n.
After this, there are m lines that describe the edges. Each line contains two integers a and b. This means that there is an edge between nodes a and b.
For each test case, output a line that contains n space separated characters that describe the colors of the nodes. Each character must be R (red) or B (blue).
There is always a solution, and you can output any valid solution.
- 1 \le t \le 100
- 2 \le n \le 10^5
- 1 \le m \le 2 \cdot 10^5
- the sum of all n and m values it at most 10^6
3 2 1 1 2 4 4 1 2 2 3 3 4 1 4 5 3 1 2 1 3 1 4
R B B B R B R B B B B