Check whether given degrees of vertices represent a Graph or Tree in Python

Suppose we have a list of degrees of some vertices. We have to check whether it is forming graph or tree.

So, if the input is like deg = [2,2,3,1,1,1], then the output will be Tree

To solve this, we will follow these steps −

  • vert := number of vertices
  • deg_sum := sum of all degree values of all vertices
  • if 2*(vert-1) is same as deg_sum, then
    • return 'Tree'
  • return 'Graph'

Let us see the following implementation to get better understanding −

Example Code

Live Demo

def solve(deg):
   vert = len(deg)
   deg_sum = sum(deg)
     
   if 2*(vert-1) == deg_sum:
      return 'Tree'
   return 'Graph'

deg = [2,2,3,1,1,1]
print(solve(deg))

Input

[2,2,3,1,1,1]

Output

Tree

Updated on: 16-Jan-2021

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