Difficulity：
2
| Test Data Sets: 5 (Hidden) | Judging:
Traditional Judge

Accepted : 251 Times | Submit :941 Times | Clicks : 2968

Accepted ： 149 Users | Submit : 163 Users | Accepted rate : 91%

Time Limit ：1000 ms | Memory Limit : 64000 KBytes

Update : 2015-06-12 09:27

Accepted : 251 Times | Submit :941 Times | Clicks : 2968

Accepted ： 149 Users | Submit : 163 Users | Accepted rate : 91%

Time Limit ：1000 ms | Memory Limit : 64000 KBytes

Update : 2015-06-12 09:27

In 1976 the "*Four Color Map Theorem*" was proven with the assistance of a computer. This theorem states that every map can be colored using only four colors, in such a way that no region is colored using the same color as a neighbor region.

Here you are asked to solve a simpler similar problem. You have to decide whether a given arbitrary connected graph can be bicolored. That is, if one can assign colors (from a palette of two) to the nodes in such a way that no two adjacent nodes have the same color. To simplify the problem you can assume:

- no node will have an edge to itself.
- the graph is nondirected. That is, if a node
*a*is said to be connected to a node*b*, then you must assume that*b*is connected to*a*. - the graph will be strongly connected. That is, there will be at least one path from any node to any other node.

**
Input：**

The input consists of several test cases. Each test case starts with a line containing the number *n* ( 1 < *n* < 200) of different nodes. The second line contains the number of edges *l*. After this, *l* lines will follow, each containing two numbers that specify an edge between the two nodes that they represent. A node in the graph will be labeled using a number *a* (0 <= *a* < *n*).

An input with *n* = 0 will mark the end of the input and is not to be processed.

**
Output：**

You have to decide whether the input graph can be bicolored or not, and print it as shown below.

**
Sample Input：**

若題目沒有特別說明，則應該以多測資的方式讀取，若不知如何讀取請參考 a001 的範例程式。

9 8 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 3 3 0 1 1 2 2 0 0

**
Sample Output
：**

BICOLORABLE. NOT BICOLORABLE.

**
Hint
：**

**
Author
：**

Miguel Revilla 2000-08-21
(Manager: taskmanager)

C |
C++ |
JAVA |
PASCAL |
---|---|---|---|

20184. EEL (0ms, 114KB, 397B) |
5095. rainism (0ms, 638KB, 377B) |
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