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B. Spotlights time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Theater stage is a rectangular field of size n × m. The

Galya is playing one-dimensional Sea Battle on a 1 × n grid. In this game a ships are placed on the grid. Each of the ships consists of b consecutive cells. No cell can be part of two ships, however

Masha wants to open her own bakery and bake muffins in one of the n cities numbered from 1 to n. There are m bidirectional roads, each of whose connects some pair of cities. To bake muffins in he