Problem #PRU-116278

Problems Methods Examples and counterexamples Pigeonhole principle Pigeonhole principle (other)

Problem

Two ants crawled along their own closed route on a \(7\times7\) board. Each ant crawled only on the sides of the cells of the board and visited each of the 64 vertices of the cells exactly once. What is the smallest possible number of cell edges, along which both the first and second ants crawled?