MathDB
Connected simple graph

Source: Turkey JBMO Team Selection Test Problem 8

May 30, 2012
floor functionceiling functioncombinatorics proposedcombinatorics

Problem Statement

Let GG be a connected simple graph. When we add an edge to GG (between two unconnected vertices), then using at most 1717 edges we can reach any vertex from any other vertex. Find the maximum number of edges to be used to reach any vertex from any other vertex in the original graph, i.e. in the graph before we add an edge.