Leetcode 1791 - Find Center of Star Graph [27/6/24]

Time Taken: ~5 mins
Tag: LeetCode Easy
Basic ideas:
- Star graph has all nodes connected to centre node. Therefore, frequency of all nodes is 1, except for centre node.
- Based on the above,
- Take the first 2 elements of edges and check which value is repeated more than once. That is the value of the central node of star graph.